这台电扇每小时大约消耗50千焦的能量。

This electric fan uses about 50 ___kJ of energy per hour.

A: 别忘了带伞，今天要下雨。B: 知道啦，我已经放在包里了。

A: Don't forget your umbrella, it's going to rain today. B: ___I know, I already packed it.