动词短语
中文翻译：打开和关闭阀门
同义词：
['open', 'close', 'regulate例句：1. The engineer needs to open and close the valves to control the flow of oil.（工程师需要打开和关闭阀门来控制石油的流动。）']
例句：
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1. The engineer needs to open and close the valves to control the flow of oil.
工程师需要打开和关闭阀门来控制石油的流动。
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2.The valves must be opened and closed carefully to prevent leaks.
必须小心地打开和关闭阀门以防止泄漏。
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3. During maintenance, the technician must open and close the valves to inspect the system.
在维护期间，技术人员必须打开和关闭阀门来检查系统。