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葫芦听见他们如此说，便也走出来求情，说这次若不是胡钧戴罪立功，只怕要大战一场，牺牲许多无辜性命，才能平息这场内乱。冀东长城脚下的潘家峪，居住着抗倭名将戚继光戚家军的后代。八路军在冀东消灭日寇，战斗中与潘家峪人民结下了生死情谊，潘家峪也因此成为革命根据地、抗日堡垒村。驻冀东丰润的日军顾问佐佐木对潘家峪人民恨之入骨，一心想彻底摧毁根据地，消灭八路军。佐佐木因找不到八路军而恼羞成怒，带领日军对潘家峪村进行了惨绝人寰的大屠杀。日军的暴行，不但没有使潘家峪人民屈服，反而对日寇更加憎恨。幸存下来的20多名青壮年组成了复仇团，舍身抗日，报仇雪恨，佐佐木被消灭了，烈士的鲜血染红了长城。The principle of opening and closing means opening to expansion and closing to modification. When the program needs to be expanded, the original code cannot be modified, but the original code should be expanded to achieve a hot plug effect. Therefore, a summary of one sentence is: in order to make the program scalable, easy to maintain and upgrade. To achieve this effect, we need to use interfaces and abstract classes, etc. We will mention this point in the later specific design.皇家跑马场位于皇城东面。安排好了，她自己就捧了本书歪着看。