to know is one thing to teach is another
知道是一回事，教是另一回事
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
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。
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