Make authorship your avocation, not your vocation.

把你副业，不要把它正业。

How much did the sideline bring the farmer family in last year?

去年副业使这家农户增加了多少收入?

Cider making was a sideline for many farmers.

酿造苹果酒是很多农民一项副业。

He decided to turn his hobby into a lucrative sideline.

他决定把自己爱好变赚钱副业。