Mandatory sign: mandatory sign requires specific behaviors or action.

强制性标识：强制性标识是对行为或行动的明确要求。

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But, let's be clear, a mandatory recall is a sign of failure.

但是，我们也清醒地认识到，强制召回是一个失灵的象征。

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Why is it mandatory that I find a plus sign?

为何正号是强制的？

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Why is it mandatory that I find a plus sign?

为何正号是强制的？

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