But when we analyze these cells chemically, we find something very interesting, a chemical in them, an enzyme called telomerase.

但当我们用化学方法分析这些细胞时，我们发现了一些非常有趣的东西，其中有一种化学物质，是一种叫做端粒酶的酶。

youdao

I am writing to tell you that we were quite disappointed with your service. We had booked a table, but when we went there at the time as arranged, only to be told there were no seats available.

我想写信告诉你，我们对你的服务非常失望。 我们已经预订了一张桌子，但是当我们按预定的时间去那里的时候，却被告知没有座位了。

youdao

As they grew more mobile, we let them move freely around the house during the day, but when we were asleep we had to contain them in a large room, otherwise they'd get up to mischief.

随着它们越来越好动，白天我们让它们在家里自由活动，但当我们睡觉时，我们必须把它们关在一个大房间里，否则它们就会胡作非为。

youdao

But when we enter the Sistine Chapel, we look up to see the most beautiful ceiling in the world.

VOA: special.2010.02.03

But when we thought about the second case, the intuition seems to be, body is the key to personal identity.

但当思考案例二时，得到的直觉似乎是，肉体是个人认同感的关键。

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But when we're thinking about actual wave behavior of electrons, it's just important to keep in the back of our head that some areas have positive amplitude and some have negative.

电子的波动行为时,我们，要记住,某些地方是正的,某些地方是负的,当我们讲到。

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But when we concentrated and redeployed the planes, we were able to become profitable again.

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But when we saw it was working, we figured we ought to give it a shot.

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But when we start charging people for things, they have an expectation about getting good service.

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