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据不可靠消息称：本季里温家双煞，两个最后只能活一个。因为上一季结束时，迪恩成了大boss米迦勒的皮囊，用中国话说，就是被附身了。那么作为凡人的迪恩就会受其控制任其摆布。这与第十季迪恩有了该隐印记还不太一样，因为该隐印记好像一种诅咒，迪恩仍是迪恩，诅咒可以化解，并最终化解。而米迦勒是大天使，早就觊觎迪恩的身体，成为他最强而有力的武器，最终达到统制宇宙的目的。（虽然没几个天使了，都死得差不多了。）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:Public final int calculation (String exp, String opt) {CBS续订《极速前进》第三十季。神经学家NatSirsukmaha anand，医学博士，不仅治疗病人的身体疾病，也治疗他们的个人问题。接下来是他对不同背景和性格但有一个共同点的女性的案例研究。他们每个人都急需浪漫。一个疯狂的夜晚，一群女人把她们过去在一个男人身上失败的秘密泄露出去，她们打赌谁能先结婚。而且看起来，纳特可能有自己的个人案例研究，他的约会应用程序列出了一个完美的匹配！众人围过来作揖祝贺。This pseudocode can well understand the event delivery mechanism: