可以理解为to be in a good mood is very important for us
it是形式主语 指代“to be in a good mood”
in表示处于那种状态 类似于in the tree 长在树上
此处for是介词，后面不能接动词原形，所以用不定式
英语翻译it is very important for us to be in a good mood中为何用to b
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