on his mind 或是 in his mind 哪个用法对?

问题描述:

on his mind 或是 in his mind 哪个用法对?
一般都说in his mind ,但是我看到一个很正式的场合用on his mind,不知道有什么特殊的含义?

两种用法都是正确的,只是所用的情况有所不同.In mind - Something I am thinking about(我在脑海中所想的,或者我意料之中的.)On mind - something I am worrying or fretting about.Something I'd rather not have...