苗床的准备方法和栽培

SSS 2011-03-29

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

发表于:2018-12-24 / 阅读(72) / 评论(0)

Scientific American(三)月

【健康】患感冒-Having a Cold

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

发表于:2018-12-26 / 阅读(46) / 评论(0)

健康-Health

与美国小学生一起学英文第5册第11期:气体

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

发表于:2019-01-10 / 阅读(45) / 评论(0)

与美国小学生一起学英文第5册

原版英语对话：Having a Cold(3)

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

发表于:2019-01-15 / 阅读(65) / 评论(0)

英语情景对话-健康

【大家说英语】第318期:寒冬保健(2)

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

发表于:2019-01-23 / 阅读(34) / 评论(0)

大家说英语

英语词汇分类：物理

matter 物质 energy 能 vacuum 真空 liquid 液体 fluid 流体 solid 固体 body 物体 mass 质量 weight 重量 density 密度 specific gravity 比重 gravity 重力 velocity 速度 kinetic energy

发表于:2019-02-07 / 阅读(64) / 评论(0)

英文语法词汇

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artificial double refraction