Never fall foul of a man who is unreasonable.

永远不要跟不讲理的人起冲突。

To fall foul of changing circumstance is in excusable.

不适应情况的变化是不可原谅的。

By parking your car here, you could fall foul of the law.

把车停在这儿，警察会找你麻烦的。

Some of these will probably fall foul of the new precedent.

一些城市的法律甚至可能与这一新的判例有冲突。

That check seems neat but sound business practices may still fall foul of it.

这项检测似乎很简洁，但一些合理的商业惯例或许因此被卡掉。