这是我做过的最难的事情之一。
但特别是，我爱你至深，才会对你说“不“，你却因此而恨我，这是我最难过的事情。
But most of all, I loved you enough to say no when you hated me for it. That was the hardest part of it.
其实，这是世界上最难做的事情，为了改变人类的行为，加德纳说。
In fact, it's one of the hardest things to do, to change human behavior, says Gardner.
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