While sweet treats can be hard to resist, the World Health Organization(WHO) has set new guidelines for people around the world. The guidelines, released on Wednesday, advise that both adults and children cut back on their sugar intake(摄取量) to stay healthy.

    In a statement, Francesco Branca, director of the WHO's nutrition department, said there is evidence that reducing daily sugar intake reduces the risk of being overweight and tooth decay(腐烂).

    The guidelines do not apply to the sugars in fresh fruit and vegetables or those that are naturally present in milk. According to the WHO, there is no reported evidence of negative effects of consuming those sugars. Instead, the new guidelines focus on “added” or “free” sugars. These include sugars that are added to processed foods and drinks such as candy and soft drinks.

    Added sugars are sometimes described as “ hidden” sugars because they exist in foods we might not think of as sweets, such as honey and ketchup(番茄酱). Health experts advise that consumers look at ingredients on food packages to help make better-informed decisions.

    The WHO recommends that people in the United States, Europe and other Western societies should cut their average sugar intake by about two-thirds, or down to just 10% of their overall calories. For developing countries, where dental care is less advanced, the WHO recommends that sugar intake be reduced to 5%.

    Scientist Kieran Clarke, of the University of Oxford, notes that for those people who can't shake their love for sweets, getting more exercise is a good solution. “If you get enough exercise, you can eat almost anything,” she said “But it's very hard to avoid large amounts of sugar unless all you're eating is fruit and vegetables.”

    The “swim-with-dolphins” tourist industry is becoming more popular every year with the increase of people's income. After all, it can cost a large amount of money to have this kind of holiday experience. So tour operators try to place eager swimmers as near as possible to the dolphins by trying to predict where the dolphins will be.

    Research has shown that while dolphins can move away if they do not want to interact (交流） with human swimmers, they do not like it at all if the swimmers slip into the water directly on top of them or if humans are in their path of travel. However, if swimmers enter the water to one side of them, the dolphins do not avoid the swimmers to the same extent.

    In all cases, the dolphins seem to have become more sensitive to the presence of the swimmers. For dolphins, swimming amongst or with humans is not necessarily a high priority. This research has shown that only 19% of any group of dolphins will participate in interaction. Young dolphins are the most likely to interact; they do seem curious about being with humans. It is believed that they see humans as “entertainment” and that the interaction is a new and unusual experience for them.

    It is frequently asked whether “swim-with-dolphins” tourism should be discontinued. The advice is that dolphins should be given enough periods of time throughout the day when they are not exposed to tourism. Permitted interactions should not be too disturbing to the dolphins since there could be mothers and calves (幼崽） present in dolphin groups. There should also be educational campaigns about the creatures and what is likely to cause danger to them.

    It is not easy to explain to someone that they cannot fulfill their lifelong dreams because the dolphins are resting, or that a mother dolphin and calf are in the area. But if we are to enjoy these remarkable animals and not just use them for our entertainment, then we must carefully monitor the “swim-with-dolphins” industry worldwide.

    For Suilasaikhan, a man living in the Inner Mongolia Autonomous Region(IMAR)(内蒙古自治区), life was hard years ago. When the wind blew, the sand made it almost impossible for him to see anything. He had to find his way back home by following the barking of dogs.

    Thankfully, things are much better today. About one third of the desert is now covered with trees, and sandstorms are less common. Ian Teh, who comes from Malaysia, came to China last year and was amazed to see people planting trees in the several deserts in northern China. "To be honest, it was hard to imagine it was ever a desert at all," he said.

    These are the results of Chinas years-long efforts to deal with desertification (沙漠化). In the 1950s, this widespread problem affected the life of about 400 million people in 18 provinces and autonomous regions in China. So China started several programs to deal with it. For example, the Three-North Shelter Forest Program, saw thousands of trees planted in northern China.

    In 1994, China joined the United Nations' convention (公约) against desertification and created the world's first law on sand prevention in 2001. With these efforts, the past five years have seen the area of desert in China decrease by 242,400 hectares.

    Desertification isn't the problem only in China. With china's success in dealing with desertification, the United Nations Environment Program (UNEP) believes the country is a good example for other countries to follow. "China is one of the most successful countries in greening the desert and has lessons to share with the world." UNEP Executive Director Erik Solheim told Xinhua.

    In many situations, the quality of your travel experience is directly affected by your ability to understand the local language. For some travelers, the challenge of learning a new tongue is one of the joys of travel, and as a result, they spend much of their time in conversations with local citizens. Others will find that just learning to read the most common signs and use every-day greetings is enough.

    No matter which view you agree with, it's necessary to take some time to learn some of the simple phrases of the new language before you go. One way of finishing this task is by listening to the new language. A phrase book can help expand your vocabulary, but hearing the sounds of the different spoken words is an excellent activity that can be done right in the comfort of your home. You can see movies in the new language or listen to the tapes or CDs. You can also download some listening material from the Internet. Just spending 15 minutes a night will improve your language skills.

    When you arrive in the new land, begin by greeting new friends in their own tongue. This may come easy or it could take some time to learn, but it's interesting. If you can't do this, then it means that you will need more practice and patience to learn these very important words. You can go out during the day and begin one-on-one conversations with shop owners, business-men and taxi drivers. This should not be done until you have learned some of the most common phrases, but once you begin to go shopping in a second language your communication skills will start to improve rapidly. You can also watch the local TV or listen to the local radio. For example, the advertisements will help you recognize the correct pronunciation of local street names.

    Regardless of how far we'd like to believe gender(性别) equality in the workplace has come, there's still a yawning gap between male and female leaders in the professional world. A 2018 statistic shows that women nowadays hold just 5.8 percent of CEOs positions at S&P 500 companies, according to Catalyst.

    While it's not a huge shock that women are somewhat underrepresented in leadership positions, what is surprising though, is the fact that females may actually be better suited to lead in almost every area, at least according to new findings from the BI Norwegian Business School.

    In their research，Professor yvind L. Martinsen and Professor Lars Glas surveyed (调查)2,900 managers with a special focus on personality types. The results were clear: Women scored higher than men in four of the five major leadership-centric categories.

    While some people believe that men inherently make better leaders — probably because they picture a leader with a commanding voice, which is more typical of men than women — this piece of research suggests that women are better at methodical management and goal-setting, openness, sociability and supportiveness, as well as ability to communicate clearly.

    There was one area in which men scored higher than women, though, and that was on emotional stability and ability to face job-related pressure and stress. The results suggest that women are more sensitive to the effects of high-pressure or highly emotional situations.

    Obviously，it's important to consider individual(个人的) differences. Anyone, regardless of gender, may be an inspiring leader and a competent boss. But next time you're hiring for a management position, you just might want to give the resumes(简历) from female candidates a harder look.

    Experts say there are about 6, 500 languages spoken throughout the world. But the United Nations estimates that about half of these languages are in danger of disappearing.

    One non-profit organization seeking to save world languages is a New York-based group called Wikitongues. Officials from Wikitongues say the organization has a simple goal: to provide the tools and support that people need to save their languages.

    Udell is the co-founder of Wikitongues. He said when a language disappears, many other things can go away as well. For example, parts of a community's culture, knowledge and identity can also be lost. Because of this. Udell believes the process of bringing languages back must be done by community members themselves, “from the ground up,” he said.

    “There is no way an outside organization can save someone's language for them.”

    Wikitongues was launched in 2016 as an open internet collection of world languages. The self-described “community” is operated by volunteers from around the world. The collection is in the form of language videos that people add to the Wikitongues website.

    There are currently more than 400 languages and dialects represented on Wikitongues' YouTube channel. Udell says more than 1,500 people from 70 different countries have added videos to the system.

    “We have people from India who record dozens of languages, which is beyond their own.” he said.

    One of Wikitongues'volunteers is Kolokwe, who lives in Namibia. His native language is Subiya, however, he does not get the chance to speak his native language every day. Like many other educated people from his area, he speaks a lot of English and Afrikaans.

    Kolokwe is hoping his involvement with Wikitongues call help keep Subiya and other African languages from going extinct. He wants the world to know about his language. But his goal goes beyond just sharing his language with others through video. He is also working to create a dictionary and language teaching materials that can be used in schools.