基本解释[机械工程]球阀英汉例句双语例句The superiority and structure characteristics of Polyethylene(PE) glove valve compared with metallic valve, and its shortcoming and the improvement were discussed.论述了PE球阀的优点及结构特点，并对其不足之处进行了改进。glove valve更多例句词组短语短语polyethylene glove valve 聚乙烯球阀glove valve更多词组专业释义机械工程球阀