Meaning of yè yú:
yè yú
业余
Adverb
in one's spare time
Zài yèyú shíjiān, wǒ xǐhuān yuèdú shūjí.
在业余时间，我喜欢阅读书籍。
In my spare time, I like reading books.
Adjective
outside working hours; amateur (historian etc)
Tā de yèyú àihào shì tán gāngqín.
他的业余爱好是弹钢琴。
His hobby outside working hours is playing the piano.
Tā shì yī wèi duì lìshǐ hěn yǒu xìngqù de yèyú lìshǐ xuéjiā.
他是一位对历史很有兴趣的业余历史学家。
He is an amateur historian with a strong interest in history.
