Once we're at sea, we're at sea.

一旦航行到海上了，那就得适应海上的情况。

He had been at sea a long time.

他已经出海很长一段时间。

Thousands of migrants are believed to be at sea, many enduring desperate conditions.

据悉已有数千名移民在海上，很多都在受着绝望遭遇的煎熬。

New York City is at sea level, so we're talking about real oxygen.

纽约市在海平面上，所以我们谈论的是真正的氧气。

Now he longs to do something to staunch the tears but he's at sea.

现在他渴望做些什么，让哭泣的妈妈坚强起来，但是他已经被眼泪淹没。

As he's been at sea, perhaps something with a nautical theme might be appropriate.

他出海去了，所以我觉得与海洋相关的东西不错。

At an altitude of 8,848 meters, barometric pressure is approximately 33% of what it is at sea level.

在 8848 米的海拔高度上，大气压只有海平面高度的三分之一。

I think instead of being all at sea, Neil's going to just be at sea – forever!

我想尼尔不会茫然无措，而是会待在海上——永远！

That brings us up behind the Hill of the Stone Table, and we'll be safe while we're at sea.

这么走可直达大石桌的后山。我们在海上的时候会很安全。

For me, just " being at sea" is a travel destination.

对我来说，“在海上”就是一个旅行目的地。

A change in air pressure that drastic is equivalent to being at sea level and dropping down 2000 meters instantly.

气压的变化如此剧烈，相当于本来在海平面突然下潜 2000 米。

By the nature of a cruise schedule, dinners are at sea.

根据邮轮时间表的性质，晚餐在海上。

As soon as the ship was at sea, the wind began to blow.

船一出海，风就刮起来了。

How many months have I been at sea?

我在海上呆了几个月?

But when he was at sea he could seem very distant.

但当他在海上时， 他似乎很遥远。

On April 19—while he was at sea—war broke out between England and America.

4 月 19 日， 当他在海上时， 英美之间爆发了战争。

So at 10 km, the air pressure is only a quarter of what it is at sea level.

因此，在 10 公里处，气压只有海平面的四分之一。

The question has to do with the expression " at sea, " or " to be at sea" (sea).

这个问题与“at sea”或“to be at sea”（海上）的表达有关。

We've been at sea for several days and without our satellite navigation system it's hard to know which way we're going.

我们已经在海上待了好几天，没有卫星导航系统，我们很难知道要前往哪条路。

He said the refugees wanted to go to Malaysia and had been at sea for 28 days before their boat's engine broke down.

他说，这些难民想去马来西亚，在他们的船的发动机发生故障之前，他们已经在海上漂流了28天。