这个表达多用于提醒他人出门在外应注意周围环境，提高警觉的语境中。它的意思是“保持头脑冷静，做好准备，随时应变”。

例句

Keep your wits about you when driving on this stretch of road – it's narrow and winding.

在这条狭窄、曲折的路上开车要多加留意。

You have to keep your wits about you when riding a bike in the city! The roads are busy and unpredictable!

在市区里骑自行车一定要保持头脑清醒，因为路面车多，路况复杂。

Keep your wits about you when you go out after dark – don't go anywhere dangerous!

天黑后外出要提高警觉，不要去危险的地方。