I must keep my nerve. I must keep my nerve, he said through tight teeth.

“我必须保持镇静，必须保持镇静，”他关说道。

And that means that the nucleus must be intact.

这就意味着细胞核必须保持完整。

We have to stay engaged in the process.

我们必须保持参与。

Vigilance is necessary if you want to beat the odds.

如果你想打破常规，必须保持警惕。

It had to be exactly as it was.

必须保持原声风。

So we have to stay vigilant.

所以我们必须保持警惕。

So that balance has to be maintained.

因此，必须保持这种平衡。

You gotta stay on top of it.

你必须保持领先。

Do you have to be skinny to be a model?

为了当模特必须保持骨感吗？

That room had to stay perfect.

那个房间必须保持完美。

Do they have to be quiet in class?

他们在课堂上必须保持安静吗？

You must be sure not to lose your cool.

你必须保持镇定，不能失了风度。

To qualify for the bonus, they must maintain a healthy weight.

要获得奖金，他们必须保持健康的体重。

Students are required to maintain silence in the library.

学生在图书馆里必须保持安静。

Thankfully, there is a way out of this trap, but it involves striking a subtle balance.

谢天谢地，还有办法摆脱困境，但是必须保持微妙的平衡。

These seats must even remain empty until women are elected.

这些席位必须保持空缺，直到女性当选。

The universities are a last line of defense, and must remain that way.

大学是最后一道防线，必须保持下去。

You must keep your head clear.

你必须保持头脑清醒。

It has to stay frozen but other than that the taste is very comfortable.

它必须保持冷冻，但味道还是不错的。

If you want my help, you have to remain calm.

如果你要我帮忙，就必须保持冷静。