活塞下行的英文

descent of piston

• 活塞:    plunger; stop; bib ...
• 下行:    down; go down
• 活塞下行驱气:    jumscavenging

例句与用法

1. As the piston descended, a ratchet engaged the piston rod and engine shaft and thus power was transmitted .
   当活塞下行时，棘轮连接活塞杆和发动机轴，因此将功率输送出去。