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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:林浩男厌倦了枯燥无味的机关工作，辞职下海创办了雄威公司。由于他自命不凡一意孤行，不久公司便债台高筑，濒临破产。他开始自暴自弃，每天醉酒后回到家中把一切怨气撒在妻子文君身上……极度伤心的文君和林浩男离了婚，扔下刚满三岁的儿子佟佟去了香港。三年后，雄威公司在肖南征等人的大力帮助下东山再起，可林浩男却因悔恨自己期盼妻子文君而忧伤。文君在香港一家公司工作，因中了小人的圈套，被诬告贪污公司财务罪入狱二年六个月……本剧主要描写林浩男辞去机关工作下海经商，遭受挫折与妻子离婚，在商海沉浮中遭遇了几段感情纠葛，但最后他发现自己深爱的依然是自己的妻子……鲜血滴滴答答，敲打着所有的人心头，项羽周身萦绕着一股浓重的狂霸之气，让士卒们赶到压抑和臣服。此类汪直精锐，无论炮铳武艺皆是上等，混杂些许鬼倭，外加此地山岭逶迤，崎岖狭隘，岙口众多，地形复杂，易守难攻，汪直残党居高临下，据险死守，攻了近两个月，竟是未见任何斩获，歼敌约莫一二百，浙兵却已损失了三四千。Model Stealing Technology: Used to detect "stealing" (i.e. Copying) models or restore the identity of training data through black boxes. For example, this can be used to steal stock market prediction models and spam filtering models so as to use them or to optimize them more effectively.　　电视剧《绿豆花》原名《牛禁坡》，讲述了1894年东学农民运动的历史中，同父异母兄弟分别成为农民军和围剿队而斗争的故事。