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When the victim hugged Liang to comfort him, Liang suddenly tied the wire of the portable massage machine around the victim's neck. 　　2.2 DisadvantagesNetflix宣布一口气续订《女子监狱》第5﹑6﹑7季。黑汉子忙答应了。　一心渴望成功，想要家人跟自己过上好日子的高一飞(韩姗丈夫)，经营着一家小电器行，但最近业务状况很糟糕，已经被债主追着上门讨债，连资金周转都成问题。小葱笑着对秦淼道：咋样？我就说你太较真了，干啥都讲究。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: