It's so hard that I can't understand it(同义句）It's____ hard _____understand

It's too hard to understand

It's_too_ hard _to_understand
too……to……意思是太……以至于不能……，
意思相当于so that

I't's too hard to understand表示太难而不好理解的意思

It's too hard to understand

too.A.to.B.句型 表由于太A而不能B 所以是 It's too hard to understand