both of a hair

例句：

1. 1.She had to shave both of her eyebrows off.
   她不得不把两边的眉毛都剃掉了。
2. 2.He was so tired that he could barely lift either of his arms.
   他太累了，连抬起双臂的力气都没有了。
3. 3. The two of them were the only ones left in the room.
   他们俩是房间里唯一剩下的人。