at sea

After five days at sea, we sighted land.

我们在海上航行了五天后见了陆地。

A wreck on shore is a beacon at sea.

前车之覆,后车之鉴。

The painting is a representation of a storm at sea.

这幅的是海上的暴风雨。

The albatross can stay airborne at sea for days at a time.

信天翁在海上以一连在空中待几天。

The invading force, conscious of their numerical inferiority at sea, decided on an airborne attack.

侵略军考虑的海上兵力处于劣势，决定采取空降袭击。

In a ten-foot dingey one can get an idea of the resources of the sea in the line of waves that is not probable to the average experience, which is never at sea in a dingey.

在一条十英尺长的小船上，一个人以了解大海如何善于兴风作浪；而对于一般从未乘小船漂海的人来说，这是无法了解的。