单词：carbon built-up
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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
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
This is the VOA Special English Development Report. A simple water pump is helping to improve the lives of poor families in several Asian and African countries. A treadle pump in vegetable fields in Bangladesh The treadle pump is based on a design d
VOA慢速英语2009年（八）月
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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[Verse 1] You got that good boy attitude and yeah, I kind like it You got the tats on your arm get a bad girl excited You put that bass in the beat, won't you beat it up inside it? I got that pumps in the bump and you know you wanna try it [Pre-Choru
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