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The meaning of cache agent is to cache the first run time, and when running the same again, it will be taken directly from the cache. The advantage of this is to avoid repeating the operation function once. If the operation is very complicated and consumes the performance, then using cache objects can improve the performance. We can first understand a simple cache column, which is the common addition and multiplication operations on the Internet. The code is as follows:Goo goo goo goo要我说，淼淼，你不如自己做个香囊装上那药给我。毕竟自己一介小民，人家是亭长，再小也是个官。第二个人是严嵩，儿子告诉他这个人很强大，强大的人还是在外面对付俺答吧。1943年秋，常德保卫战爆发前夕，城内动荡不安。小警察何平安平静地生活了九年，作为一名红军老战士、地下党员，他照顾烈士遗孀和幼子，在常德隐姓埋名。在一次执行公务的时候，何平安与大小姐沈湘菱不打不相识。日本人投放细菌弹造成常德城伤亡惨重。为了常德的百姓安危，何平安与潜伏的日本奸细展开了连番的斗智斗勇，但身份被迫暴露。沈湘菱惊诧之余对他倾心。日军冲破外围防线，对常德步步紧逼。沈湘菱与何平安并肩作战。在常德苦战16天，弹尽粮绝常德城沦陷。何平安在巷战中壮烈牺牲，沈湘菱带着烈士遗孤等到了常德城光复。