一些不小心掉下来的木头着火了，开始燃烧。

Some of the wood that had been carelessly thrown down, caught fire and began to blaze.

youdao

他撞到树上，因为他试图不撞到前面卡车上掉下来的箱子。

He crashed into the tree because he was trying not to hit a box that had fallen off the truck ahead of him.

youdao

小心可能从架子上掉下来的物品。

Beware of objects that can fall off shelves.

youdao

So this doesn't fall, for example, at 6 a nought, but that's a really good question.

比如这在６ａ０的时候不会掉下来，但这个问题很好。

麻省理工公开课 - 化学原理课程节选

The lifetime earnings of a tightwire walker who falls down and kills himself aren't very good.

一个掉下来摔死自己的走钢丝的人,他一生的收入也不会很好。

耶鲁公开课 - 金融市场课程节选

Well, first of all, you may not survive for long, if you truly don't accept the fact that things, people being no exception fall when left in mid-air.

首先，你可能活不长，如果你不接受，人会从半空中掉下来的事实。

哈佛公开课 - 幸福课课程节选