在最近的爆炸事件之后，航空公司说我们必须检查所有的包裹；他们告诉我们必须这么做。

After the recent bombing, the airlines said that we'd have to check all parcels; they told us we had to do it.

youdao

我们必须这么做,因为其他人都这么做。

We have to do it this way because that's the way everyone else does it。

youdao

史蒂文说这是必须的。我们必须这么做。

Steven said it's necessary. We have to do it.

youdao

All right, so I did this not at all purposely, but this can point out for you that you need to make sure that the number of electrons that you have in your molecular orbital does match up with the total number that you have in your atomic orbitals.

我并不是故意这么做的，但这告诉我们必须要保证,分子轨道里的电子数,和原子轨道里的,总电子数能对上。

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I think there are a lot of steps that we can and should take towards mitigating it,

我认为我们有许多方法来减缓气候变暖，而且我们也必须这么做。

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