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D > B enters the synchronized block, and since instance is not null at this time, it immediately leaves the synchronized block and returns the result to the program calling the method. E > At this point, thread B intends to use the Singleton instance, only to find that it has not been initialized, so an error occurs. Therefore, there is still the possibility of errors in the program. In fact, the running process of the program is very complicated. From this, we can see that it is more difficult and challenging to write programs especially in multi-threaded environment. We further optimized the program:　　刘雨林往哈尔滨找飞机遭遇敌特袭击，险些丧命；在通化机场，报务员收到奇怪消息—“13号攻击成功”，敌特若隐若现。刘雨林率队来到731旧址，找到隐藏飞机的洞口。由于鲁八不小心碰碎毒气瓶导致众人恐慌，继而导火索被点燃。为阻止爆炸，刘雨林感染病毒。通过闫铁所设之局，嫌疑人一个个被排除，一切变得扑朔迷离。View startup container status:5. At the same time, press and hold the volume reduction key on the left side of the mobile phone;Main output chain:/shimmy (swing)Stored procedure: (Delete after one year according to the difference between the current time and the time of entering the blacklist)