Internal exhaust valve increases down stroke speed.

内部排气阀增加下冲速度。

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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。

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This technique eliminates the tube in conventional mechanical lifting, takes hollow rod as the transmission medium and oil flow channel and discharges fluid during down stroke.

该项工艺省去原机械举升中的油管，利用空心杆作为传动介质和油流通道，下冲程挤压排液。

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He starts scraping under my sideburns, holding the skin taut, and then shaves down in one stroke, exerting no pressure on the razor.

WSJ: Razor Sharp | The Return of the Classic Wet Shave

Dr. Snyder believes D-serine is there as a fail-safe to make sure memory cells spring into action only when they are supposed to--a process that breaks down during a stroke.

FORBES: Repairing The Brain

Snyder believes that D-serine is there as a fail-safe to make sure that memory cells spring into action only when they are supposed to--a process that breaks down during a stroke.

FORBES: Repairing The Brain