Think about vitamin D when you're catching up on summer rays. It's sometimes called the “sunshine vitamin” because it's produced in your skin in response to sunlight. Vitamin D is a fat-soluble (脂溶性的) vitamin in a family of compounds that includes vitamins D-1, D-2, and D-3. It can affect as many as 2,000 genes in the body.

    Vitamin D has several important functions. Perhaps the most vital are regulating the absorption of calcium and phosphorous（磷）, and promoting normal immune system function. Getting enough vitamin D is important for normal growth and development of bones and teeth, as well as improving resistance against certain diseases.

    In addition to its primary benefits, research suggests that vitamin D may also play a role in: reducing your risk of multiple sclerosis（多发性硬化）, according to a 2006 study published in the Journal of the American Medical Association decreasing your chance of developing heart disease, according to 2008 findings published in Circulation helping to reduce your possibility of developing the flu, according to 2010 research published in the American Journal of Clinical Nutrition regulating mood and warding off depression losing weight or preventing heart disease.

    How do you get it? Your body produces vitamin D naturally when it is directly exposed to sunlight. A little can go a long way. All you need is 10 minutes a day of midday, pre-sunscreen sun exposure,especially if you have fair skin. Besides getting vitamin D through sunlight, you can also get it through certain foods and supplements to ensure adequate levels of the vitamin in your blood.

    Color is fundamental in home design-something you'll always have in every room. A grasp of how to manage color in your spaces is one of the first steps to creating rooms you'll love to live in. Do you want a room that's full of life? Or are you just looking for a place to relax after a long day?{#blank#}1{#/blank#}, color is the key to making a room feel the way you want it to feel.

    Over the years, there have been a number of different techniques to help designers approach this important point.{#blank#}2{#/blank#}, they can get a little complex. But good news is that there're really only three kinds of decisions you need to make about color in your home: the small ones, the medium ones, and the large ones.

    {#blank#}3{#/blank#}.They're the little spots of color like throw pillows, mirrors and baskets that most of us use to add visual interest to our rooms. Less tiring than painting your walls and less expensive than buying a colorful sofa, small color choices bring with them the significant benefit of being easily changeable.

    Medium color choices are generally furniture pieces such as sofas, dinner tables or bookshelves.{#blank#}4{#/blank#}.They require a bigger commitment than smaller ones, and they have a more powerful effect on the feeling of a space.

    The large color decision in your rooms concern the walls, ceilings, and floors. Whether you're looking at wallpaper or paint, the time, effort and relative expense put into it are significant.{#blank#}5{#/blank#}.

A. While all of them are useful

B. Whatever you're looking for

C. If you're experimenting with a color

D. Small color choices are the ones we're most familiar with

E. It's not really a good idea to use too many small color pieces

F. So it pays to be sure, because you want to get it right the first time

G. Color choices in this range are a step up from the small ones in two major ways

Dear Customers,

    I love slipping into a comfortable chair for a long read－as I relax into the chair; I also relax into the author's words, stories and ideas. The physical book is so elegant that it disappears into the background and what remains is the author's world.

    Today, we, at Amazon, are excited to announce Mindle, a wireless, portable reading device with instant access to more than 90, 000 books, magazines and newspapers.

    We've been working on Mindle for more than three years. Our top design goal was for Mindle to disappear in your hands―to get out of the way－so you can enjoy your reading, also wanted to go beyond the physical book. Mindle is wireless, so whether you're lying in bed or riding a train, you can think of a book and have it in less than 60 seconds. No computer is needed－you do your reading directly from the device.

    We chose the same wireless technology used in advanced mobile phones. But unlike phones there are no monthly wireless bills, no service or data plans, and no yearly contracts. There is no software to install. We want you to get lost in your reading and not in the technology.

    Mindle uses a new kind of display called electronic paper. Sharp and natural with no strong light reading on Mindle is nothing like reading from a computer screen. Mindle weighs only 10.3 ounces－less than a paperback, but can carry two hundred books.

    Enjoy learning about Mindle and many thanks!

    Jeff Bezos Founder CEO

    Even though it's the 18th movie from the Marvel Universe, Black Panther is the first one to feature a black superhero with a primarily black cast(演员阵容).

    The film tells the story of the Black Panther, a superhero who takes his father's place as king of the fictional African country Wakanda. The film came out in Chinese mainland cinemas on March 9, passing the $1 billion (about 6 billion yuan) mark at the global box office and becoming the No. 2 superhero release of all time on March 10.

    However, Black Panther means more than just the money it's making. As the Guardian noted, the film is already being regarded as "a positive force for social change".

    The wild success of Black Panther lies in the fact that it gives voices to minorities who are rarely given room in popular culture. "It carries a weight that neither Thor nor Captain America could lift: serving a black audience that has long gone under-represented," Time noted.

    "It makes me feel proud and confident that we made it on screen in that way," Rasheed Butler, 14, from a black community in California, US, told the Marin Independent Journal.

    The superhero Black Panther is inspiring, but the movie also highlights brilliant black women. For example, Black Panther's teenage sister is a tech genius. She designs gadgets for her brother and develops resources that make the isolated Wakanda wealthy scientifically and technologically advanced.

    "What I love about the way this film represents women is that each and every one of us is an individual, unique," Kenyan-Mexican actress Lupita Nyong'o, who plays a spy in the movie, told the Los Angeles Times. "I think that's a very powerful message to send to children – both male and female."

    Powerful characters aside, the movie has social implications. While the Black Panther tries to keep his country and people away from the outside world, others want to make use of Wakanda's advanced technology to fight injustice. "But neither option is truly tenable," The Verge noted. "It suggests that these destructive cycles may only be broken through guidance, education, and global leadership."

    Instead of hiding away from current issues of race and economic differences, the movie explores what it means to be black in the US, in Africa and in the world. It deals "head-on with the issues affecting modern-day black life", Time concluded.

    For the first time, the World Health Organization has included Traditional Chinese Medicine (TCM) in its globally influential medical compendium(手册), according to an international science journal.

    An article published by Nature on Wednesday said that TCM will be included in the latest version of the International Classification of Diseases (ICD)set to be released next year. Starting from the 1800s, the ICD has been improved and published in a series of editions, reflecting the advances in health and medical science over time. It serves as the foundation for the identification of global health trends, and the international standard for diseases and health conditions.

    The latest ICD is based largely on the work of the International Classification of Traditional Medicine (ICTM) project's experts from around the world. These experts had been working on traditional medicine research and practices for years.

    China has been promoting the modernization of TCM and pushing for TCM to gain acceptance worldwide. Tu Youyou, a Chinese expert focusing on the scientific study of drugs and medicines, was awarded the Nobel Prize in Medicine in 2015 for her research in TCM. Her discovery has saved millions of lives in developing countries in South Asia, Africa and South America. TCM is sure to grow in popularity globally.

    Though the application of traditional Chinese medicine, acupuncture(针灸) and other traditional medical practices has been on the rise, there's still a shortage of global classification and terminology(术语) tools for traditional medicine, according to officials of the WHO.

    "The decision is to promote the safe and effective use of traditional medicine by regulating, researching and combining traditional medicine products, practitioners and practice into health systems, where appropriate," the WHO was quoted as saying by Nature.

Are you too responsible？

Taking responsibility is an essential element of strong leadership. But when the scales tip to over-responsibility, both the leader and their team suffer. {#blank#}1{#/blank#}

Define what you're truly responsible for. When it feels like the weight of the world is on your shoulders, try the following pie-chart exercise.{#blank#}2{#/blank#} Draw a circle on your paper and allocate responsibility for the situation to each person on your list. Add up those amounts and determine the remaining percentage. The amount left over is your actual share of responsibility.

Examine your assumptions. To start overturning your over-responsibility habit, examine the beliefs and fears that keep it alive. Are they really true? Reframe the release of responsibility and consider that you're empowering others. Allow them to struggle with a task, solve their own problem, or own up to a mistake. {#blank#}3{#/blank#}

Give responsibilities back. Whether you willingly assumed a given responsibility or it was placed on you, it's time to return it to its rightful owner. Identify one responsibility you can return to a specific person. {#blank#}4{#/blank#} Expect a few discomfort at first, but resist the temptation to jump back in.

Accept help. If you're overly responsible, you likely say "yes" whenever others ask for help but don't ask for any yourself. It's time to rebalance your give-accept proportion {#blank#}5{#/blank#} If someone asks if they can take something off your plate or offers to do something for you, say "yes."

Rightsizing your responsibility is not about escaping what is yours to own but finding a more appropriate balance. By taking 100% of your responsibility, but not more, you will avoid unnecessary stress and help others grow.

A.Practice accepting offers of help. 

B.Grab a piece of paper and list everyone involved. 

C.It may be a simple task that someone else should be doing. 

D.The following strategies may help you find a more appropriate balance. 

E.In this way，you help them develop greater competence and confidence. 

F.Leaders who ask for help increase the feelings of connection on their team. 

G.If so，these could be signs that you have an overactive sense of responsibility.