They would not be likely to alight on the surface of the sea.

它们大概不会降落于海面上。

Soon afterwards, the balloon began to descend and it landed near an airfield.

过了一会儿，气球开始降落，并且在一个机场附近着陆了。

We found a place where we could land.

我们发现了一块可以降落的地方。

He buckled the safety belt when the plane was making a landing.

飞机降落时，他扣上安全带。