I only play jazz as a hobby.

我弹奏爵士乐只是一种业余爱好。

《牛津词典》

He hasn't got any hobbies—unless you call watching TV a hobby.

他没有什么爱好—除非你把看电视也称作爱好。

《牛津词典》

youdao

She worked at a rock quarry. She made paper beads as a hobby.

VOA: special.2010.06.28

So I think a really good way to deal with stress is to find a hobby that you enjoy, personally,

所以我觉得应对压力的一个非常好的办法就是给自己找个让自己乐在其中的爱好，

对付压力的方法 - SpeakingMax英语口语达人

And I've always loved cooking as a hobby,

而且我业余时间也喜欢做料理，

我的书出版了 - SpeakingMax英语口语达人

Step three is what turns a hobby or lifestyle business into a real business.

FORBES: You don't need a better mousetrap, or three steps to start a successful business

Mr. Irrizary, an 80-year-old, has more than 200 bikes he fixes and restores as a hobby.

WSJ: Showing Off Their Schwinns

It is outrageous that someone enjoying a hobby can be victim of such aggression.

CNN: Dutch teens charged in linesman's death