冲程的英文：
stroke

参考例句：

Bore x stroke
缸径x冲程

scavenging stroke
扫气[换气]冲程,清除冲程,排泄行程

The position of the valves during the power stroke are both closed
在作功冲程期间，气门的位置都是关闭的。

The remainder of the power stroke is an adiabatic expansion.
动力冲程的后段是绝热膨胀过程。

stroke是什么意思：
n. 击球（动作）；划水动作；轻抚；抚摩；笔画；行动；钟声；中风
v. 轻抚，抚摩（物体表面或头发等）

a butterfly stroke
蝶式游泳

Her husband is a stroke.
她丈夫是个尾桨手。

Who is the stroke of the boat.
谁是这艘船的尾桨手。

He stroked the ball into the bag.
他轻轻一触，球就进袋了。

An oak is not felled at one stroke
万事不能一蹴而就