名词中文翻译
中文翻译：针活塞
同义词：
['needle pump', 'needle valve']
例句：
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1. The needle piston is a crucial component in the engine's operation.
针活塞是引擎运作中的关键部件。
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2. The mechanic replaced the needle piston with a new one after inspecting the engine.
机械师在检查引擎后，用一个新的针活塞替换了旧的。
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3. The needle piston is responsible for controlling the flow of oil through the engine.
针活塞负责控制机油通过引擎的流量。