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

信天翁海上可以一连空中待几天。

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

侵略军考虑到海上兵力处于劣势，决定采取空降袭击。

The painting is a representation of a storm at sea.

这幅描绘是海上暴风雨。

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.

海上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.

一条十英尺长小船上，一个人可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人来说，这是无法了解。