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本剧以唐老师（傅彪饰）、于老师（吴越饰）、房老师（杨青饰）与学生们的关系为主线。旁涉以唐老师与张玲母（沈丹萍饰）动荡不安的情感线索、于老师青春浪漫的爱情。面对高考、面对命运选择与承诺时的巨大精神压力、各种光怪陆离的表现和青春的冲动。学生家长们对孩子前途的期待、担忧以及各种出格离奇的表现……With support.田遥等人急了：那他们不是要自打三个耳光，还要承认自己错了？周菡眼中爆出明亮的神采，脆声道：谢周爷爷教诲，是晚辈想差了。万一栾布把心一横直接出兵，或者经受不住韩信和蒯彻的催促，那可就麻烦了。(未完待续……) show_style();。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: