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Note: Only one layer can be established in this way. For recursive establishment,: os.makedirs ()小镇上声名狼藉的脱衣舞俱乐部即将关门大吉，营业的最后一晚却变成血腥之夜！当一群遭受致命感染的顾客现身闹场，俱乐部老板娘和她的脱衣舞嚷们必须挺身而出，情况却逐渐一发不可收拾……Extraction structure or pattern: It is often necessary to store the knowledge, extraction structure or pattern in the professional field in a better way. For example, expert developers make good use of design patterns.Free throw:1. Injury of vascular wall the lumen surface of vascular wall is covered by endothelial cells, Normal vascular endothelial cells with a total area of more than 1000m2 have antithrombotic properties, It passes through a negative surface charge, Release various substances, such as ATPase ADP enzyme, tissue plasminogen activator (tpA), thrombin regulatory protein (TM), tissue factor pathway inhibitor (TFPI), endothelium derived relaxation factor (EDRF) PGI2 and other substances, prevent platelet adhesion and aggregation, promote fibrinolysis, inhibit blood coagulation process, enhance anticoagulation, and achieve the effects of maintaining blood fluidity and preventing thrombosis.刘邦舒舒服服地躺在水池之中，嘿嘿笑道：是啊，一共七十二颗黑痣。