名词
中文翻译：气动操作方向阀同义词
同义词：
['气动操作阀门，气动控制阀，气动调节阀']
例句：
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1. The pneumatic operated directional valve is used to control the flow of air in the pipeline.
气动操作方向阀用于控制管道中空气的流动。
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2. The pneumatic operated directional valve was designed to improve efficiency and reduce maintenance costs.
气动操作方向阀被设计来提高效率和减少维护成本。
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3. The pneumatic operated directional valve is an essential component of the HVAC system.
气动操作方向阀是HVAC系统的一个关键组成部分。