高压气体流过密封环顶端并进入其后面，施加向外的压力到缸筒壁上。
It passes over the top of the ring, and gets behind it to force it outward against the cylinder wall.
叶密被长硬毛背面的特别是在脉上。花对生。显著被微柔毛有环的花冠筒在里面。
Leaves densely hirsute especially on veins of abaxial surface. Flowers opposite. Corolla tube conspicuously puberulent annulate inside.
聚四氟乙烯内衬直管， 套管，弯头，三通，四通，大小头，筒体，空压机-制氧机- 活塞环、密封圈和汽配封圈。
Teflon - lined pipe, casing, elbow, the three exchanges or four, size head, cylinder, air compressor - oxygen - ring, gasket seal ring and auto parts.
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