He set his heart upon it.

他专心致志。

Grandpa has set his heart upon it, your people like it, and I can't get on without you.

爷爷用心了，你的人喜欢，我离不开你。

He had, doubtless, set his heart upon an elephant; or, possibly, with Hamlet, he meant to eat a crocodile.

毫无疑问，他已经把心放在了大象身上。 或者，可能，对于哈姆雷特， 他打算吃掉一条鳄鱼。