怎样才能正确地使用"spend"?

SPEND作“花费”时，发出动作的可以是人也可以是物。花费的可以是“时间”也可以是“金钱”。
例：I spend 3 hours in finishing my work.
I spend 300 dollors on this PC.

It spends my 3 hours to finish my work
This PC spends my 300 dollors.

词组用法，注意spend (in) doing sth. 一下就OK啦。

SPEND 用法不是很复杂

spend (in) doing sth.
spend on sth.