Mr Smith is above his head中文

be above one (one’s head) 太高深,无法理解.如：
The book is above the boy.这个孩子读不懂这本书.
The lecture was above the heads of most students.这个讲座大部分学生理解不了.
be above one's head = be over one's head
所以意思是Mr Smith无法理解