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李敬文这才放手，跟着又提醒道：小心些。(2) Under the condition of low temperature, the elastic cushion plays the function of automatic compensation, ensuring the sealing performance of the valve, with simple and compact structure, good sealing performance, convenient installation and disassembly, and strong practicability.何况到底是不是韩信，还有待验证，此事不可莽撞。王尚书虽然同情他。1996年，一场百年不遇的洪灾冲垮了绿岗村农民养家保命的几百亩山地，乡亲们看着满目疮痍的家园失声痛哭。河北农大教授李保国随科技扶贫组来到村里，乡亲们绝望的泪水刺痛了他，他决心扎根绿岗，指导果农改良苹果品种。在此之前，李保国曾在太行山深处的南川峪为小流域治理付出了十几年心血，直到把那里变成“太行山最绿的地方”。在绿岗，初来乍到的李保国穿着打扮和长相比农民还土气，并不被认可，他的科技主张也屡遭果农抵制，朴实的李教授最终用行动和成果打动和感化了乡亲们，绿岗苹果也成为享誉世界的品牌。科技改变了土生土长的农民们的命运，而李保国却在收获成果的季节倒在了他的岗位上。This is very understandable. The purpose of the command mode is to decouple the sender and executor of the command and separate the request from the execution. Students familiar with Struts should know that Struts is actually a technology that separates the request from the presentation, which inevitably involves the idea of the command mode!