1. It was an innocent deception, meant as a joke.
    那是无伤大雅的鬼把戏, 开个玩笑而已.

2. Inviting the fire brigade to put out a nonexistent fire is a crude form of deception which no self-respecting student would ever indulge in.
    请消防队来扑灭一场根本没有的大火是一种低级骗局，有自尊心的大学生决不会去做。