not know chalk from cheese
... Dont Know Him From Adam 根本不知道那家伙是谁 not know chalk from cheese 不辨黑白 to know right from wrong 分辨对错 ...
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无明，就是无所明了，也就是糊涂，不明是非，不辨黑白。
Being ignorant means not understanding anything. It means being muddled, and not being able to tell right from wrong, or black from white.
youdao
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