动词短语
中文翻译：通常打开的阀门同义词
同义词：
['commonly open valve', 'normally open valve']
例句：
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1. The engineer opened the normally open valve to release pressure.
工程师打开了通常打开的阀门以释放压力。
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2. The valve is normally open, allowing air to flow freely.
这个阀门通常是打开的，允许空气自由流动。
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3. During maintenance, the technicians must frequently check and open normally open valves.
在维护期间，技术人员必须经常检查并打开通常打开的阀门。