Purpose:Service leading brand, method leading value;

服务成就品牌，渠道决定价值；

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If method register is invoked simultaneously by multiple threads, it could result in a race condition leading to an incorrect _set value.

如果方法register同时由多个线程调用，那么它会产生一个竞争状态，导致出现错误的_ set值。

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Explaining this text method can used for the leading engineering practices, having the good fulfillment value.

说明本文方法可用于指导工程实践，具有较好的实践价值。

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