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。
Why is it mandatory that I find a plus sign?
为何正号是强制的？
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。
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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