Vigilance is necessary if you want to beat the odds.

如果你想打破常规，必须保持警惕。

And that means that the nucleus must be intact.

这就意味着细胞核必须保持完整。

There's a linguistics standard that has to be maintained.

存在必须要保持的语言标准。

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，”他咬紧道。

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。

Constant vigilance is necessary in order to avoid accidents.

为了避免意外事故， 必须经常保持警惕。

We must remain vigilant, act fast and aggressively and look out for one another.

我们必须保持警惕，迅速采取积极行动，互相照。

But there was a general consensus among participants that Ukraine must remain united.

但与会者达成了一个共识，那就是乌克兰必须保持团结。

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。

'I must keep in good health, and not die, ' I replied.

“我必须保持健康，不要死去。”我答道。

We and all Americans might be weary of today's politics, but we must stay engaged.

我们和所有美国人都厌倦了当今的政治，但我们必须保持忙碌。

You must be sure not to lose your cool.

你必须保持镇定，不能失了风度。

So before they actually play, they have to be calm surrender.

在他们真正开始比赛之前，他们必须保持沉稳、冷静。

So that balance has to be maintained.

因此，必须保持这种平衡。

Students are required to maintain silence in the library.

学生在图书馆里必须保持安静。

We have to stay engaged in the process.

我们必须保持参与。

That is the hard reality we face today, said Ms. Glick. We must remain vigilant.

这也是我们今天面临的现实。我们必须保持警觉。

But we must be very quiet, or he will take fright and fly away.

但我们必须保持安静，否则他会被惊吓飞走。

The response to those states must be constant vigilance.

应对这些国家必须要始终保持警惕。

See? ! See you have to stay active right?

看到了？！所以你必须保持运动，对吧？