1、Internal exhaust valve increases down stroke speed.
內(nèi)部排氣閥增加下沖速度。

2、Deformation of helical buckling appeared on rod during down stroke is also analyzed.
同時(shí)分析了下沖程抽油桿所產(chǎn)生的螺旋彎曲變形。

3、Both the down stroke and the up stroke are highlighted in different colors.
無論是向上和向下中風(fēng)中風(fēng)是突出了不同的顏色。

down stroke翻譯