... a piece of chalk 一支粉笔 chalk up 记下；取得；归咎于... know chalk from cheese 有判断力[通常用于否...
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not know chalk from cheese 不辨黑白
Such a young child does not know chalk from cheese.
这样年幼的孩子是不辨是非的。
youdao
In fact, he often changes girlfriend, for he doesn't know chalk from cheese.
事实上，他经常换女友，因为他不知好歹。
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