on the side
另外
A:What does your friend Jim do?
A:你的朋友吉姆是干什么的?
B:He is a teacher, but he makes a little money on the side by repairing cars in his free time.
B:他是个教师,但也在空闲时兼修汽车赚点钱。
A:He can repair cars? I can't believe it.
A:他会修汽车?真没看出来。
B:Believe me, he is the first-class.
B:相信我,他修车技术是一流的。