名词
中文翻译：主阀门
同义词：
['main valve', 'primary control valve例句：1. The main check valve prevents air from entering the engine during operation.（主阀门在操作时防止空气进入发动机。）2. Main check valves are used to control the flow of fluids in pipelines.（主阀门用于控制管道中流体的流动。）']
例句：
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1. The main check valve prevents air from entering the engine during operation.
主阀门在操作时防止空气进入发动机。
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2. Main check valves are used to control the flow of fluids in pipelines.
主阀门用于控制管道中流体的流动。
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3.During maintenance, the technician replaced the main check valve with a new one.
维护期间，技术人员用一个新的主阀门替换了旧的。