The most difficult thing in the world is to know how to do a thing and to watch someone else doing it wrong, without commenting.

The most difficult thing in the world is to know how to do a thing and to watch someone else doing it wrong, without commenting.

世界上最困难的事情是知道如何做一件事，然后看着别人做错了，而不加评论。

-- T. H. White 特伦斯·韩伯瑞·怀特