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流 形（manifold）的概念最早是在1854年由 Riemann 提出的(德文Mannigfaltigkeit)，现代使用的流形定义则是由 Hermann Weyl 在1913年给出的。江泽涵先生对这个名词的翻译出自文天祥《正气歌》“天地有正气，杂然赋流形”，日本人则将之译为“多样体”，二者孰雅... 阅读全文
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Billions of dollars are flowing into online advertising. But marketers also are confronting an uncomfortable reality: rampant fraud.rampant：猖獗的，狂暴的 About 36% of all Web traffic is considered fake, the product of computers hijacked by viruses and programmed to visit sites, according to estimates c... 阅读全文
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转自 http://www.zhizhihu.com/html/y2010/2292.htmlKernel FunctionsBelow is a list of some kernel functions available from the existing literature. As was the case with previous articles, everyLaTeX notationfor the formulas below are readily available fromtheiralternate text html tag. I can not guarante 阅读全文
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The appointment of India-born Satya Nadella as Microsoft Corp.'s CEO has caused a bit of a stir in China, where people are questioning why Indians but not Chinese are getting top jobs in the U.S.Language and familiarity with Western culture are the obvious reasons why chief executives such as In 阅读全文
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Buying real estate involves weighing a lot of factors: location, price . . . smell?Some condo developers are betting that the best way to a buyer's heart is through the nose. The latest sales tools are signature scents designed to enhance a buyer's or renter's impression of a building.co 阅读全文
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AT THE ACADEMY AWARDS earlier this month, Kerry Washington, the star of the ABC-TV series 'Scandal,' wore a lilac Jason Wu gown, tailor-made to accommodate what she playfully called her little 'accessory'-a growing baby bump.These days, that's just how stylish mothers-to-be are t 阅读全文
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Anyone who has felt like the odd duck of the group can take heart from new research from Harvard Business School that says sticking out in distinct ways can lend you an air of presence or influence.Standing out in certain circumstances, like wearing sweats in a luxury store, also appears to boost an 阅读全文
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Mistrust between U.S. and Malaysian air-accident investigators has hampered a multinational probe into the jetliner that went missing three weeks ago, people familiar with the investigation said, with no clear leads emerging about who or what was responsible for its disappearance.hamper：妨碍，束缚 jet... 阅读全文
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Entrepreneur and author ShaoLan Hsueh thinks that English-speakers can start learning to read Chinese in less than 10 minutes. The language, she says, has more than 20,000 written characters, which most students in China learn by rote memorization. Ms. Hsueh's new book, 'Chineasy,' aims 阅读全文
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The default background for Microsoft's Windows XP operating system -- a perfect blue sky full of cotton-candy clouds above rolling hills with impeccably trimmed grass and daffodils -- is the spring day we wish could last forever.rolling hills：起伏群山 impeccably：无可挑剔地 trimmed：修整过的，平衡的 daffodil... 阅读全文