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我梦见爹带了好些吃的玩的东西家来，他们还不相信。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:板栗忙劝众人出去，说小心些总不错。《放学后福不福 第二季》沿用了之前的主演班底，但把拍摄地点搬到 了中国，长城、王府井等等北京地标 建筑都在其中有所展现。剧中还安排了模仿最近大热韩剧《来自星星的你》中的桥段。Bozan found that when taking notes, simply combining vocabulary and color skills will greatly improve the efficiency of taking notes and the efficiency of memory. Including the use of images, etc. Later, combining his own experience and research, he invented mind map, a popular tool all over the world.每集只有10分钟的短剧，男主有一个特异功能，可以清清楚楚听到身边人心里的想法。但是今天遇到的这个女孩，男主却听不到她心里的想法，为什么呢？