单词：high-purity material
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This is Scientific American's 60-Second Science. I'm Karen Hopkin, this'll just take a minute. On February 8th, we told you about scientists who had created a device worn over the knees that could harvest the energy you otherwise waste while walking.
Scientific American(二)月
This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. After water, tea is the world's most popular drink. Now three New York City high school students have discovered what maybe a bruing scandal because th
Scientific American(七)月
See to it that....务必....;努力设法使达到....目的 例句： See to it that you come to my house with your baby. 一定要带着你的宝宝来我家。 See to it that you use the high-quality decoration material to decorate my new house. 务
跟艾米莉一起学口语
Turning Cigarette Butts to Batteries 烟头转变成电池 If you see a person carelessly throw a cigarette to the ground, what are you likely to think? That depends. If you hate people throwing things on the ground, you might think, That person shou
2014年VOA慢速英语(九)月
题目要求： The following chart shows the different attitudes of men and women towards down-to-earth marriage. Look at the chart carefully and write your response in about 200 words, in which you should interpret the chart, state the reasons and
英语作文
(1)A: We can offer you this in different levels of quality. B: Is there much of a difference in price ? A: Yes ,the economy model is about 30% less. B: Well take that one . A:这产品我们有三种不同等级的品质。 B:价钱也有很大的分别
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