The piston travels down on the intake stroke, up on the compression stroke, down on the power stroke and up on the exhaust stroke.
进气行程，活塞下行；压缩行程，活塞上行；做功行程，活塞下行；排气行程，活塞上行。
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。
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。
During the breaststroke underwater pullout, the arms pull DOWN during the power phase, and then arms recover back UP to start the first stroke.
蛙泳水下蹬壁滑行时，手臂在蹬壁出发后要向下拨水，然后手臂恢复开始第一次蛙泳手划水。
The down and up stroke of each key is registered and highlighted on a graphical image of a keyboard.
下和中风的每个关键是注册，并强调对图形图像的键盘。
The down and up stroke of each key is registered and highlighted on a graphical image of a keyboard.
下和中风的每个关键是注册，并强调对图形图像的键盘。
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