名词
中文翻译：活塞
同义词：
['cylinder', 'plunger例句：1. The piston is the moving part of the engine that moves the piston rod.（活塞是发动机中移动的部分，它推动活塞杆。）']
例句：
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1. The piston is the moving part of the engine that moves the piston rod.
活塞是发动机中移动的部分，它推动活塞杆。
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2.The piston rings are designed to keep the oil from leaking out of the cylinder.
活塞环的设计是为了保持油不从气缸中泄漏出来。
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3. The piston is made of steel and has a small hole in it for air to pass through.
活塞由钢制成，有一个小孔供空气通过。