See a cell phone cover that you like on Taobao? Forget about placing an order, paying the bill online and waiting for days for it to be delivered to you. In the near future, you'll be able to get it in minutes just by hitting "print" on your computer. You might find it hard to believe that you could actually "print" an object as you would a picture. But it is not that hard to understand how it would work. Just as a traditional printer sprays (喷) ink onto paper line by line, modem 3-D printers spread material onto a surface layer by layer, from the bottom to the top, gradually building up a shape.

    Instead of ink, the materials the 3-D printer uses are mainly plastic, resin (树脂) and certain metals. The thinner each layer is — from a millimeter to less than the width of a hair —the smoother and finer the object will be. This may sound like a completely new technology, but the truth is that 3-D printing has been around since the late 1980s. Back then, it was barely affordable for most people, so few knew about it.

Last year, though, saw a big change in the 3-D printing industry — printers became much cheaper. For example, 10 years ago a desktop 3-D printer might have cost £20,000, while now they cost only about £ 1,000, according to the BBC. Taken out of the factory and introduced to more diverse and common uses, 3-D printing can create just about anything you can think of — flutes (笛子), bikinis, jewelry, aircraft parts and even human organs. In fact, scientists from Cornell University in New York have just made an artificial ear using a 3-D printer, according to Science Daily. The fake ear looks and acts exactly like a natural one.

    However, as 3-D printing becomes more common, it may bring about certain problems —such as piracy. "Once you can download a coffee maker, or print out a new set of kitchen utensils (餐具) on your personal 3-D printer, who will visit a retail (零售的) store again?", an expert in 3-D printing told Forbes News. Even more frightening, what if anyone in the world could use a 3-D printer to print out a fully functioning gun?

    Most of us have friends as close as family, who, when necessary, we'd call at 3 a.m. for comfort or congratulations because we know they won't get angry about us. They're almost part of us, and we share with them with our troubles and successes. But although I love these Pour Your Heart Out friends, I also need the energy of my Let's Party friends. These friends care on a different level—less stressful, less deep—but they still care.

    And such friendships are important. 'With some friends, you want to be playful rather than deeply opening your heart,' says psychotherapist (心理治疗师) Susie Orbach. 'They feel relaxed and easy that you won't keep talking about your problems or stories, and you also feel the same way. It's healthy to have lots of different friends at different levels of closeness because not only is it impossible to be close to everyone, it's also unnecessary. You need to look at yourself from different angles (角度). This is the only way you can experiment with different parts of yourself.'

    Of course, it's upsetting to be with friends who can't-or-won't -allow you to open up your heart when you really need to find someone to listen to. But if we accept our Let's Party friends for what they want to offer us—fun, laughter, full stop—then we enrich our lives greatly.

    Louise Blanchard Bethune showed early promise in math. But Louise did not go to school. Instead, her father taught her at home until she was 11 years old. She also discovered a skill for planning houses. It developed into a lifelong interest in architecture and a place in history as the first professional female architect in the United States.

    After graduating from high school in 1874, Louise traveled and studied. She hoped to prepare herself to attend the new architecture school at Cornell University. But then Buffalo's leading architectural firm of Richard A. Waite and F.W. Caulkins offered her a job. She knew that architects gained their training from practical experience, not from school. She took the job.

Louise worked there as an assistant, 10 hours a day for five years. She learned —-and mastered—-drawing and architectural design. She also met her husband, Robert A. Bethune. Their new firm, R.A. and LBethune, opened in October 1881.

    Bethune appeared to be the strength of the business. At the turn of the 20th century, the city of Buffalo was rapidly expanding to meet the demands of growing industry. The firm received tasks to build hundreds of structures throughout western New York. The firm designed lots of schools, apartment buildings, department stores, churches and factories.

    Bethune believed that being an architect meant being an artist, a scientist and a business person. She made a point of advocating for women in the profession. She became a member of the Western Association of Architects(WAA) in 1885. In 1888, she was the first woman to join the American Institute of Architects(AIA). Besides, Bethune took a firm stand on equal treatment for women architects. She insisted on equal pay for equal work.

    Bethune left almost no papers or letters, and few people recognize her name today. But her legacy remains in the foothold she established for women in the field of architecture. She started her own firm and enjoyed a successful career.

    Nelson Mandela is respected and admired around the world. And to South Africans he is a superstar. He is a hero who shocked the world by fighting for peace between races, despite the 27 years he spent in the prison of the South Africa's white, racist regime (种族主义政权).

    Mandela who won the nation's first all-race elections after the fall of apartheid (种族隔离) in 1994, retired in 1999. But he remains as popular as ever. His popularity has inspired an entire national industry. His portrait (肖像) has appeared at many places, including on some goods. His face has appeared on a South African coin, and some business leaders hope to build a statue in his likeness—the Statue of Freedom. It would stand taller than New York's Statue of Liberty.

    “His popularity is similar to that of John F. Kennedy with US or Winston Churchill in Britain, but few politicians in his times have achieved his level of admiration,” said Tom Lodge, head of the political science department of the University of the Witwatersrand, “What a skilled performer Mandela has been throughout his political career! He's a very, very clever man.”

    However, he is far from perfect. Most articles for his birthday, which appeared in every major South African newspaper on the day, briefly mentioned that Mandela did have his shortcomings.

    Then they returned to their flowing praises. “Through the ages, the human race has had its icons (偶像)—men and women who rose above ordinary people to inspire their generations,” The Mail and Guardian Weekly said. “In our generation, the gods presented us Nelson Mandela.”

    Need a fall fix? Try one from these great places.

    ⒈Mackinac Island, Michigan

    The only way to reach this famed car-free island is by boat and ferry, and once visitors arrive, they are attracted by the history, scenery and fall colors. "It's a throwback to years past, a little town, and there's a big state park as well," Blackwell says. "You're allowed to have boats all around the island."

    ⒉Tellico Lake, Tennessee

    With nearly 400 miles of shoreline, this waterway flowing out of the Great Smoky Mountains is largely unexploited, well-protected in its natural state. Fall visitors find a range of colors reflecting in the clean waters, says Blackwell, who vacationed in the area with his family as a child. "The thick forest there just allows you to see more greenery and wildlife."

    ⒊Dillon Reservoir, Colorado

    With an hour from Denver, this lake is home to what claims to be the nation's highest sailing club, at an altitude of more than 9,000 feet. Marinas in the towns of Dillon and Frisco make it easy to get out on the water and to see the bright yellows and golds of fall leaves. "People are surprised that there's boating in Colorado, and you can see the mountains just before the snowball," Blackwell says.

    ⒋Lake Monroe, Indiana

    The state's largest lake is surrounded by more than 13,000 acres of protected forest and three recreation areas, making it an ideal place to see fall colors, particularly from oaks and the tulip poplar, the state tree. " It's a gem (宝石) in southern Indiana," says Blackwell, who grew up in the area. "There are lots of different activities: canoeing, kayaking and fishing."

When {#blank#}1{#/blank#} (ask) by a TV reporter to talk about air and water quality in his hometown, Qi Mu noted, "The air is great now, and we can take more walks and enjoy being outdoors again." He felt quite pleased because the villagers were living {#blank#}2{#/blank#} (harmonious) with nature once more. However, he could not forget about an earlier time {#blank#}3{#/blank#} his village had been struggling with a serious air quality problem.

In the 1990s, garbage from nearby city was usually brought to the village. "How can we make use of this?" The villagers wondered. Soon they found that garbage could be used {#blank#}4{#/blank#} (feed) pigs. "Over the next few years, {#blank#}5{#/blank#} (dozen) of pig farms were set up," Qi recalled. But then nobody in the village wanted to open their windows. "The smell from the garbage and pig waste was making us sick," Qi said. The numbers of mosquitoes and flies were also {#blank#}6{#/blank#} (horrify). "Under such circumstances, no single women wanted to marry anyone in our village and move here," Qi {#blank#}7{#/blank#} (sigh).

The villagers could no longer tolerate the situation. So {#blank#}8{#/blank#} initiative was launched and "clean-up" campaign was added to the government agenda, including restricting large vehicles {#blank#}9{#/blank#} passing through the village. Garbage from the city was no longer disposed of in the village and more trees were planted. "We can all breathe more freely now that the natural beauty of our village {#blank#}10{#/blank#} (restore) since then," said Qi.