The piston is essentially a cylindrical plug that moves up and down in the engine cylinder.
实质上活塞是一个在气缸中上下移动的圆筒状的塞子。
The plug frame is cylindrical and communicates with a pipe line disposed inside the endoscope.
栓壳是筒形，并在嵌合状态与配置于内窥镜内部的管路连通。
The plug frame is cylindrical and communicates with a pipe line disposed inside the endoscope.
栓壳是筒形，并在嵌合状态与配置于内窥镜内部的管路连通。
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