it is not clear to me that/how.
问题描述：
it is not clear to me that/how.
这句意思是什么?还有,请帮我造句以下.
答
意思：我不清楚.
造句：
It's not clear to me that what this book is trying to tell.
我不清楚这本书是要告诉我们什么.
It's not clear to me how human beings evolve.
我不知道人类是怎么进化的.