Argentina in the late nineteenth century was an exciting place. Around 1870, it was experiencing an economic(经济的)boom, and the capital, Buenos Aires, attracted many people. Farmers, as well as a flood of foreigners from Spain and Italy, came to Buenos Aires seeking jobs. These jobs didn′t pay well, and the people felt lonely and disappointed with their new life in the city. As the unhappy newcomers mixed together in the poor parts of the city, the dance known an the tango(探戈舞)came into being.

    At the beginning the tango was a dance of the lower classes. It was danced in the bars and streets. At that time there many fewer women than men, so if a man didn′t want to be left out, his only choice was to dance with another man so that he could attract the attention of the few available women. Gradually, the dance spread into the upper classes of Argentinean society and became more respectable.

    In Europe at this time, strong interest in dance from around the world was beginning.

    The interest in international dance was especially evident in Paris. Every kind of dance from ballet(芭蕾舞)to belly dancing could be found on the stages of the Paris theaters of the Paris theaters. After tango dances from Argentina arrive in Europe, they began to draw the interest of the public an they performed their exiting dance in cafes, Though not everyone approved of the new dance, saying it was a little too shocking, the dance did find enough supporters to make it popular.

    The popularity（流行）Of the tango continued to grow in many other parts of the world. Soldiers who returned to the United States from World War I brought the tango to North America, It reached Japan in 1926, and in 2003 the Argentinean embassy in Seoul hired a local tango dancer to act an a kind of dance ambassador, and promote tango dancing throughout South Korea.

    While we all try to find happiness, sometimes we still end up feeling low. While most people can control this feeling, low moods can stay with some, leading to depression. About 322 million people suffered from depression in 2015, according to a report by the World Health Organization in February. This is more than 4 percent of the world's population.

    Depression is described by the WHO as a mental disorder. It has several symptoms including sadness, loss of interest and feelings of low self-worth. In severe cases, depression may even lead to suicide.

    The number of people living with depression is increasing. The WHO reported a rise of 18.4 percent between 2005 and 2015. Young people are a group known to suffer with depression. “The pressures on today's youth are like no other generation, perhaps,” Dan Chisholm, an official of WHO, told Reuters.

    In China, depression among young people is on the rise, Zhu Zhuohong, a psychology professor with the Chinese Academy of Sciences, told Xinhua News Agency. Competition to outperform others, especially in education, can cause a lot of pressure for Chinese youth.

    Almost 1.2 million Chinese people aged 15 to 24 suffer from depression, according to a report released by British science journal The Lancet in May.

    Luckily, more and more efforts are being made to deal with this problem. This year's World Health Day, held on April 7, will focus on depression. The day will highlight (强调) the “Depression: let's talk” campaign. The campaign aims to make sure that people with depression both seek and get help.

    Keeping fit often means sharing a busy pathway with cyclists, runners and walkers, but imagine facing the task of doing it all without being able to see or hear. It is a challenge many disabled athletes face, unless someone agrees to be their eyes and ears.

    Newly formed group Achilles Brisbane pairs vision－and hearing－impaired（视觉和听觉受损的）athletes with a person who would like to guide them.

    “When we go out, we're always going out into an unknown course,”said Achilles Brisbane president Jane Britt, who is both vision and hearing impaired. “It's much less frightening to have someone beside you that has full hearing to listen for you and tell you what's there.”

    Ms. Cullen and Ms. Britt meet up most Saturday mornings to take part in the free five－kilometer Southbank park run. Their partnership is built on trust, but Ms. Britt said that it took time to develop.

    Ms. Britt said it took an unexpected storm for her to trust Ms. Cullen completely. “There was violent rain, my glasses were broken and we were walking together,”she said. “I suddenly had to tell her I couldn't see anything, and I was going to have to completely trust her. From that time I knew it was going to work because she was so good about dealing with the special situation we both found ourselves in. ”

    Isabella Allen and her seeing-eye dog Tatum are two new additions to the Achilles programme. Ms. Allen kept active by running and cycling but found it difficult to keep going as her vision became worse. After nearly giving up completely, she worked up the courage to ask Brisbane to find someone to share a boat with her.

    Ms. Alien said the fear of not finding anyone to row with almost stopped her from reaching out to Achilles Brisbane. “But, they found people and matched me to them.”she said, “It's the best thing I've ever done. ”

    It is commonly believed that the earliest Chinese paper-cuts appeared during the sixth century. Some scholars believe it was even earlier. Legend has it that during the Western Han Dynasty(206BC-AD24), Emperor Wudi was very sad after one of his favorite concubines, Madame Li, died. A Taoist priest, Li Shaoweng, cut a piece of hemp paper in the shape of Madame Li. When evening fell, the emperor's servants lit candles in his bedroom; the reflection of that paper-cut on the wall made the emperor think about his beloved concubine.

    The Yuxian paper-cut is different from most paper-cuts produced in other regions of China. Paper-cuts from other regions are mostly cut with scissors or knives from single-colored paper, such as red or black paper.

    There are four major procedures to making the Yuxian paper-cut: First, sketch the pattern on the draft paper; second, fasten the draft to the paper to be cut; third, use a knife to carve out the pattern; and fourth, dye (染色) the paper-cut with various colors.

    Precise cutting skills are needed to make a piece of the Yuxian paper-cut, which highlights the craft maker's artistic taste and dyeing skills. That explains the following saying: "The successful making of a Yuxian paper-cut is 30 percent dependent on the maker's cutting skills, and 70 percent on the maker's dyeing skills."

    The traditional Yuxian paper-cut highlights two themes: flowers and characters in Chinese operas. The paper-cut is particularly known for its vivid description of characters in various traditional Chinese operas. In October 2009, the art of Yuxian's paper-cut was added to the list of Intangible Cultural Heritage (非物质文化遗产) established by UNESCO (United Nations Educational, Scientific, and Cultural Organization).

    They train four hours a day, often waking up at 4:30 or 5:00 for before-school practices. Their evenings and weekends are eaten up by twice-weekly travel games. Every day is the same; there's no break. No, these aren't Olympic athletes; they're kids.

    The benefits of sports are obvious. So, it's not surprising that, according to CNN, 41 million American children play competitive sports. But when does this become too much of a good thing?

    Seven years ago, a survey in Sporting Kid magazine found 84 percent of athletes' parents had observed belligerent behavior in other parents at games and that 80 percent had been targets of this behavior. What does this say about sports culture, and our culture as a whole? Some parents have become so crazy about their children's winning that they don't stop to think about what example they are setting.

    If athletes are constantly surrounded by adults who scream at coaches and attack sports officials, they may think that this is acceptable behavior. They'll try to win at all costs. In other words, they won't know how to accept defeat, and learn from it.

    The amount of time some athletes spend practicing can be dangerous. According to Sports Illustrated, over 3.5 million athletes younger that 15 suffered from a sports-related injury—that's nearly one in ten! Many injuries cause permanent（永久的）damage if not treated.

    So what can we do about this situation? Some argue that there is no problem, because sports has always been and will always be competitive. But did your grandparents spend hours each day practicing tennis or volleyball? No, they probably played with the neighborhood kids after school, not worrying about winning. All they wanted was to have fun. And that's what we need to change in youth sports—focus on enjoyment.

    Blue Planet It's latest episode focuses on how plastic is having a devastating effect on the ocean and slowly poisoning our sea creatures. Researchers recently also found that sea creatures living in the deepest place on Earth, the Mariana Trench, have plastic in their stomachs. Indeed, the oceans are drowning in plastic.

    Though it seems now that the world couldn't possibly function without plastics, plastics are a remarkably recent invention. The first plastic bags were introduced in the 1950s, the same decade that plastic packaging began gaining in popularity in the United States. This growth has happened so fast that science is still catching up with the change. Plastics pollution research, for instance, is still a very early science.

    We put all these plastics into the environment and we still don't really know what the outcomes are going to be. What we do know, though, is disturbing. Ocean plastic is estimated to kill millions of marine animals every year. Nearly 700 species, including endangered ones, are known to have been affected by it. One in three leatherback turtles, which often mistake plastic bags for jellyfish, have been found with plastic in their bellies. Ninety percent of seabirds are now eating plastics on a regular basis. By 2050, that figure is expected to rise to 100 percent.

    And it's not just wildlife that is threatened by the plastics in our seas. Humans are consuming plastics through the seafood we eat. I could understand why some people see ocean plastic as a disaster, worth mentioning in the same breath as climate change. But ocean plastic is not as complicated as climate change. There are no ocean trash deniers (否认者), at least so far. To do something about it, we don't have to remake our planet energy system.

    This is not a problem where we don't know what the solution is. We know how to pick up garbage. Anyone can do it. We know how to dispose (处理) of it. We know how to recycle. We can all start by thinking twice before we use single-use plastic products. Things that may seem ordinary, like using a reusable bottle or a reusable bag--when taken collectively, these choices really do make a difference.