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This actual damage exists between the above levels 3-4.接着，小葱又将古藤缠住秦淼的腰，绑紧了，另让她挽起一段，道：师妹不用怕，就跟荡秋千一样。In the exchange, apart from the necessary schedule discussion, Sun Yimin's teacher and the person in charge were full of expectation and encouragement when talking about contemporary students, but they were more exclamatory about college students' employment, postgraduate entrance examination and entrepreneurship.女孩图莉普离家出走误上一班无尽的列车，她必须与球形机器人小一和柯基国王艾蒂科斯一路冒险寻找回家的方法。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: