它可以在下雨时被冲刷掉，也可以释放到大气中，而磷与钙和铁结合，可以在土壤中保存数千年。

It can be washed out when it rains or it can be released to the atmosphere, whereas phosphorus combines with calcium and iron, and can be preserved in the soil for thousands of years.

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京沪高铁将在四年半内建成，其中经过北京的部分长达72公里。

The full railway, which includes 72-kilometers section through Beijing, will be completed in four and a half years.

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2004年，一个探索机器人发现了黄钾铁矾。

In 2004, an exploration robot discovered jarosite.

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I was on the TGV the third day it opened which was-- it opened on September twenty-eighth,1981, and I was there on September thirtieth, taking a trip to Lyon,though it only went fast when it really got to a certain point here.

我在法国高铁开通后的第三天,它是在,1981年九月二十八日开通的,我是在九月三十日去的,去里昂旅行,它一路上开的非常快,直到到了站

耶鲁公开课 - 1871年后的法国课程节选