单词：breakdown in liquids
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This is Scientific Americans 60-Second Science. Im Steve Mirsky. Got a minute? To keep your car purring, you have to change the oil. Such maintenance produces eight billion gallons of used motor oil annually. Some waste oil does get re-refined to pro
Scientific American(三)月
A: How are you feeling today? B: I have a terrible cold! A: Where do you think you picked that up? B: A lot of people in my gym have it. Maybe I got it from the equipment. A: Have you taken anything for it? B: I think that I am just going to rest and
健康-Health
RANDI KAYE, CNN CORRESPONDENT: We take our shoes off, remove our laptops, and toss our bottled water all in the name of safety. But are we any safer today than we were before 9/11? Not exactly, says Bruce Schneier, author and security technologist. B
CNN2010年(一)月
Gas 气体 There are three different kinds of matter. They are solids, liquids and gases. 物质分三种：固体、液体和气体。 Gas has no shape, so you can't touch gas. 气体本无形，所以你触摸不到。 Gas moves very freely. 气体能
与美国小学生一起学英文第5册
A: You look a bit under the weather. B: I am not feeling all the great. I think I have that crud that is going around. A: I know that its going around the dorms. B: My boyfriend hasnt been feeling so well. Maybe he passed it on to me. A: I have some
英语情景对话-健康
December 29 12月29日 Read it! 读读看！ Oh, no! Everyone is getting sick. 糟糕！大家都生病了。 Taylor has a headache. 泰乐头痛， She is also starting to cough a lot. 也开始不断咳嗽。 Alex's stomach doesn't feel very good. 亚
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