在通话过程中锁定你的屏幕！
若要确保枚举过程中的线程安全性，可以在整个枚举过程中锁定集合。
To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration.
若要确保枚举过程中的线程安全性，可以在整个枚举过程中锁定集合。
To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration.
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