A man was hit on the head by a thing falling down kilometers high altitude.But he didn't get hurt.
问题描述：
A man was hit on the head by a thing falling down kilometers high altitude.But he didn't get hurt.
猜一猜.
A man was hit on the head by a thing falling down kilometers high altitude（几千米高空）.But he didn't get hurt.Why?
答
因为是雨滴. A drop of rain.