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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:这个黄月海都无耻到这个程度，他还用给对方留颜面？之前不理会，也只是懒得搭理罢了。A5.1. 2.2 External nose and nasal cavity.Against Jin Shi and Tao Shi (in Wooden Leaf)"To live a meaningful life is to constantly give yourself new things."Model skew为了击败罗刹•暗无妖兽王，有一个为培养斗龙战士而存在的古老族派，叫“龙武族”。龙武族分别由六大星门组建，分别是代表火象的星火罗门、代表水象的寒山星门、代表金象的孤斗星门、代表光象的月空星流门、还有代表木象的莫林天门和代表土象的皇沙星门。龙武族的族人非常神秘，一直隐蔽生活在六越山，但从来没有人知道他们是因何存在，因何隐蔽……