Q

It is so weak that a little wind can move it. It is so strong that you can cut it with a knife and leave no trace. What is it？
它很虚弱，一点点风就可以使它移动。它又很坚强，用刀砍它都不会留下痕迹。它是什么？

A

Water.
水。

点睛一笔

leave no trace的意思是“不留痕迹”。水真是又虚弱又坚强，因为小小的风就可以将水吹起波澜，但是锋利的刀刃却拿水无可奈何。