To know is one thing; to teach is quite another.

知道是一回事，教又是另一回事。（学者未必是良师。）

youdao

To know is one thing; to teach is another.

知为一回事，教是另一回事。

youdao

To know a language is one thing, to teach it is another.

懂得一种语言是一回事，教这种语言是另一回事。

youdao

To know a language is one thing, to teach it is another.

懂得一种语言是一回事，教这种语言是另一回事。

youdao