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龙先生说，为防止母亲被骗，特地为她的手机设置了三道技术防线，进行安全加固：禁止安装非官方应用、禁止接听陌生号码、拦截陌生短信。
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``@receiver isNil ifTrue: ``@nilBlock -> ``@receiver ifNil: ``@nilBlockOr maybe with single backticks?
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