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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With the down stroke of a wing during flight, the body moves up, but the subsequent upstroke can counter that force.

用飞行翼的上下行程，身体向上移动，但随后的冲程可以对抗这种力量。

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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