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故事发生在六十年代的美国，勒维恩（奥斯卡·伊萨克 Oscar Isaac 饰）是一位名不见经传的民谣歌手，生活困顿的他无家可归亦没有固定的工作，每晚得靠朋友们的救济才得以寻得安身之处。可是，尽管陷入了窘境，但固执的勒维恩却不愿意了顺应大众的喜好而做出无奈的改变，也正因为此，他和交往多年的好友简（凯瑞·穆丽根 Carey Mulligan 饰）和吉姆（贾斯汀·丁伯莱克 Justin Timberlake 饰）之间的关系也跌落到了冰点，更让勒维恩感到烦心的是，简的腹中竟然怀上了自己的孩子。大宋还不是亡了？汪直闭目，不想再与徐海多说。本片根据鲍里斯·瓦西里耶夫于小说《这里的黎明静悄悄》改编。亦可看做1972年版翻拍作一时之间，村民的呼声逐渐高亢。Then, after waiting for a long enough time, when the original article had disappeared from her memory, he wrote the poem into prose.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: