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Let's start with the General Motors, because it looks like GM is looking to spiff up its car-line by importing one of its most popular European models to this side of the Atlantic. Beginning in the th
商业报道2006年
It seemed like a good ideabecause rivers and ponds in Bangladesh were contaminated with bacteria, Bangladeshis switched to wells. But soon after, in the early 80s, researchers realized those wells were harming Bangladeshis with a new poisonarsenic. T
Scientific American(十一)月
This book stinks! is really a bad review. But even a classic work can start to smell when it gets old enough. Now chemists have developed a technique that identifies what kind of degradation process an old book or historical document is going through
Scientific American(十一)月
Air pollution 空气污染 A: I've heard of ground-level ozone but can you explain what it is exactly? A:我听说近地面臭氧，但是你能确切解释一下是什么吗？ B:Yes, it's one of the main air pollutants. Factories don't emit it dire
职业技术英语口语
Judging a Book by Its Odor A study in the journal Analytical Chemistry identifies various organic compounds that old books give off and that can be analyzed noninvasively, offering important clues to an historic work's condition and prognosis. Steve
60秒科学
WASHINGTON, July 19 (Xinhua) -- The number of Americans initially applying for unemployment aid last week rose sharply after hitting a record low since mid-May in the previous week, the U.S. Labor Department reported Thursday. The figure for seasonal
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