单词:self-rectifying tubes
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Lesson 38 Learning How to ApologizeWhat are the hardest words to pronounce in English? It seems that I'm sorry are the two most difficult words for most people to say. Perhaps this difficulty lies in the so-called losing of face phrase; when a person
This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute? Asbestos increases the risk for certain cancers. The fibers are thought to do so by skewering cells, setting off chemical reactions that lead to inflammation,
85 新功效的抗生素在加州诞生 DATE=8-15-01 TITLE=SCIENCE REPORT - Designer Antibiotics BYLINE=Jerilyn Watson (Start at 1'04
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Solar cells convert sunlight to electricity. But they don't take advantage of all that solar heat, thereby missing out on the majority of the solar ene
Todd: OK so, here we go, now Terry you were saying that you went from Vancouver to San Diego. How many days did that take? Terry: Um, the total trip took 42 days but that included one day on the bus up and then one day on the bus back so 40 days on t
AUDIE CORNISH, HOST: Another classic TV show has been retooled for Netflix. Today the streaming channel released One Day At A Time, a new version of the sitcom from the '70s and '80s. It's focused on a Cuban-American family, and as NPR TV critic Eric