be a trial to

• 让 ... 很伤脑筋

be a trial to的用法和样例：

例句

1. Her child is a trial to his teachers.
   她的孩子让老师很伤脑筋。
2. The over-punctual can be as much a trial to others as the unpunctual.
   提前半个小时到达的客人是最使人讨厌的。