[口语]“挺懂行的”用英语怎么说？

stuff作名词意思是“物品，东西，玩意儿”

它本就是个非正式的口语词汇

know your stuff的意思就是

精通业务，懂行

举个例子：

Well, you certainly seem to know your stuff.

看来你对还挺懂行。