1) be good at this kind of work
工于此道
2) He is great on the subject.
他精于此道。
3) In or into this.
此中，于此
5) To have nothing more to say
言尽于此
6) nothing is greater [more important] than
莫大于此
补充资料：工于
长于；善于：～心计ㄧ他～工笔花鸟。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条