at sea

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

信天翁可以连空中待几天。

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

侵略军考虑到自己的兵力处劣势，决定采取空降袭击。

The painting is a representation of a storm at sea.

这幅描绘的是的暴风雨。

A wreck on shore is a beacon at sea.

前车之覆,后车之鉴。

After five days at sea, we sighted land.

我们航行了五天后见到了陆地。

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.

条十英尺长的小船，个人可以了解大如何善兴风作浪；而对从未乘小船漂的人来说，这是无法了解的。