“Can't hold a candle to” is a popular expression. When there wasn't electricity, someone would have a servant light his way by holding a candle. The expression meant that the person who cannot hold a candle to you is not fit even to be your servant. Now, it means such a person cannot compare or compete.

    Another expression is “hold your tongue.” It means to be still and not talk. “Hold your tongue” is not something you would tell a friend. But a parent or teacher might use the expression to quiet a noisy child.

    “Hold out” is an expression one hears often in sports reports and labor news. It means to refuse to play or work. Professional football and baseball players ''hold out” if their team refuses to pay them what they think they are worth.

    The expression “hold up” has several different meanings. One is a robbery. A man with a gun may say, “This is a hold-up. Give me your money.” Another meaning is to delay. A driver who was held up by heavy traffic might be late for work. Another meaning is for a story to be considered true after an investigation. A story can hold up if it is proved true.

    “Hold on” is another expression, which means waiting or stopping. As you leave for school, your brother may say, “Hold on, you forgot your book.” It is used to ask a telephone caller to wait and not hang up his telephone.

    Our final expression is “hold the line”. That means to keep a problem or situation from getting worse—to hold steady. For example, the president may say he will “hold the line on taxes”. He means there will be no increase in taxes.

    The next generation of artificial intelligence (AI) may be sitting right beneath you, at least if furniture maker Ikea has any say in the matter. The Swedish furniture company's “future-living” research lab in Copenhagen is conducting a survey to understand what people want when it comes to smart furniture.

    AI is now walking into more aspects of people's daily lives. Self-driving cars are just around the corner, and AI robots can play and beat the best players of strategy games. As smart home technologies have become more ubiquitous, products ranging from smart electrical outlets（插座）to smart smoke alarms are flooding the market. Therefore, it's not surprising that Ikea would be moving in the same direction.

    Exactly why people would want their sofa or bed frame to speak to then, track their daily movements or offer help is not yet clear. Though Ikea's the new survey doesn't directly answer that question, it does provide a hint of what people would feel comfortable with. Most participants wanted a more human0like form of virtual（虚拟的）assistants, as opposed to one that is more robotic. In terms of the ideal gender（性别）of the assistants, the most popular choice was neither male nor female. Few wanted a religious form of AI.

    Just as with human friends, most wanted AI friends that were like them, affirming their own worldview. They wanted an AI assistant that was reasonably intelligent-that could collect data to predict what a person wanted before he or she asked, and that could prevent someone from making mistakes.

    This is not the first time that Ikea has set foot in the field or futuristic technologies. In addition to wireless charging tables and chainless bikes that never rust（生锈）, the furniture giant has also pictured smart kitchens that can cook the best meal. To decide on how intelligent you want your next sofa or bookshelf to be, you can take Ikea's survey online.

    More and more people like bicycling and it is no surprise. It's fun, healthy and good for the environment. Maybe that's why there are 1.4 billion bicycles and only 400 million cars on roads worldwide today. Bikes can take you almost anywhere, and there is no oil cost!

    If you get on a bicycle and ride it, you may discover something new all around you. Stopping and getting off a bike is easier than stopping and getting out of your cars. You can bike to work and benefit from the enjoyable exercise without polluting the environment. You don't even have to ride all the way.

    Folding bikes work well for people who ride the train. Just fold the bike and take it with you. You can do the same on an airplane. A folding bike can be packed in a suitcase. You can also take a common bike with you when you fly. But be sure to look for information by getting on airline websites. Not all airlines are bicycle friendly to travellers.

    Here are some of Health Benefits of Bicycling：

    Bicycling helps to prevent heart diseases.

    Bicycling helps to control your weight.

    A 15­minute bike ride to and from work three times a week burns off five kilos of fat in a year.

    Bicycling can improve your mood.

    Exercise like bicycling has been shown to make people feel better, more relaxed and self-confident.

    Bicycling is healthier than driving.

    The bristlecone pine (狐尾松) is one of the longest-living things on Earth. These trees, with their strangely shaped branches, can live up to 5,000 years, but experts worry that a warming climate in some areas may threaten its future.

    Researchers say warmer weather is permitting a similar kind of tree, the limber pine (柔枝松), to take over good growing places from the ancient bristlecone. They say the tree is being forced out of mountainous areas where it grows.

    Scientists at the University of California, Davis, say climate change is causing the trees to compete with each other.

    Brian Smithers led the research project. “The limber pine is taking all the good spots,” he said.

    Bristlecone pines grow in high mountain forests in eastern California, Nevada and Utah. In the mountains, they face high winds and extreme temperatures.

    The difficult conditions leave the trees with twisted(变形的) branches and shapes. To survive long periods without water, parts of the trees die, including much of their outer bark (外皮). This makes the trees appear dead, except for small green pine needles. They show that the tree is indeed alive.

    The oldest living bristlecone pine is somewhere in California. It is not marked in any special way, so that people do not try to damage it.

    The limber pine is the bristlecone's distant relative and competitor, which can also live a long time — up to 2,000 years. Researchers say it is found at lower elevations (纬度), where temperatures are warmer.

    The scientists at the University of California, Davis, recently released the results of a three-year study. Their research centered on trees that have started growing in the last 50 years in the Great Basin area of California's White Mountains. The researchers found that most of the trees growing at higher elevations were limber pines.

    Smithers said, “It's very strange to see it charging higher up and not see the bristlecone charging up the mountain slopes ahead of the limber pine.”

    Smithers said the bristlecones are not in danger of disappearing, but he thinks they could be forced out of some places where they have grown for thousands of years.

    If you follow these insider tips, your photos will look like you had the place to yourself at the popular tourist attractions.

    Vatican Museums: Vatican City

    The Vatican draws more than five million people each year, and queues can reach four hours during peak season. Christie Hudson, senior communications manager at Expedia，recommends, choosing a skip-the-line tour.“ This not only lets you avoid the ticket counter，but also includes the use of a private partner entrance.” Extra time to visit the Sistine Chapel? Yes!

    Bamboo Forest: Kyoto, Japan

    Bamboo Forest is the most worthy sight in Kyoto. If you're longing to enjoy the pathways and take pictures in total quietness, Kyoto Arashiyama Travel Guide recommends hitting the famous Bamboo Grove Path as early in the morning as possible—think 7 a.m. if you're up for it. Don't miss these hidden treasures you can only witness in Japan.

    Chichen Itza: Yucatán，Mexico

    Home to E1 Castillo and the Temple of the Warriors, Chichen Itza is a must-see. Want to beat the rush? Schedule an early tour that takes place before a site opens to the public. Led by an archaeologist guide，it's full of fascinating insights and facts—without tons of pack-wearing tourists.

    Louvre Museum: Paris, France

    The Louvre is one of the most popular museums on the planet. If waiting around in line to get in isn't the way you prefer to spend your time in Paris，consider purchasing a reserved ticket. This will give you entry to the pyramid within a half-hour window. The Louvre is also open until 9:45 p.m. on Wednesdays and Fridays, if you're up for some late-night art visits.

I am a 22-year-old artist. My journey through art led me to being an environmentalist. {#blank#}1{#/blank#} we consider waste may be useful when we think about it in a different light. Although largely {#blank#}2{#/blank#} (ignore), materials thrown away provide plenty of resources for us artists to give them a second life. In my hands, glass bottles, plastic bags, and other waste {#blank#}3{#/blank#} (item) become a form of sustainable art. I want to motivate the people who buy this type of art to contribute to the planet' s welfare.