on their head

• adv. 倒立(落在头上；很容易地)

on their head的用法和样例：

例句

1. Bits of plaster rained down on their heads from the ceiling, filling their hair and eyes.
   灰泥从天花板上碎落到他们头上，弄得他们满头满眼全是。
2. The stone hit the window and a shatter of glass fall on their head.
   石头击中窗户，一阵碎玻璃落到他们头上。