be Greek to
美
英 
例句
Those grammatical rules always seem to be Greek to the little boy.
那些语法规则对这个小男孩来说就像天书一样。
I can tell you from personal experience that you don't have to have sons or be Greek to have a dirty front door!
我可以从我的个人经历来告诉你,你不必非生儿子,或者是作为一个希腊人必须有一扇很脏的门。