down stroke造句

1、Internal exhaust valve increases down stroke speed.
内部排气阀增加下冲速度。

2、Deformation of helical buckling appeared on rod during down stroke is also analyzed.
同时分析了下冲程抽油杆所产生的螺旋弯曲变形。

3、Both the down stroke and the up stroke are highlighted in different colors.
无论是向上和向下中风中风是突出了不同的颜色。