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Crash Course 天文篇

This is called the “lookback time”, and it's a cru cial tool for cosmology: by observing very distant objects, we can see the Universe when it was young!

这叫做“回溯时间”,是的一个重要工具:通过观察非常遥远的物体,我们可以看到轻时的子!

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Since four-fifths of the world's potash is traded internationally, the impact of price spikes will be felt in every agricultural region in the world, warns Humphrey Knight of cru, a consultancy.

咨询公司CRU的汉弗莱·奈特警告称,由于全球五分之四的钾肥都是国际交易,全球所有农业地区都将感受到钾肥价格飙升的影响。

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