He takes advantage of her ignorance and simplicity; it isn 't cricket.

他乘机利用她的无知和单纯，这种做法是不光明正大的。

youdao

We don't benefit from ignorance.

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Ignorance can't possibly cost more.

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But the election officer didn't believe Carey's pleas of ignorance and disqualified him last November from the forthcoming rerun.

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