These four strokes are intake stroke, compression stroke, power stroke and exhaust stroke.

这四招进气行程，紧缩行程，动力冲程和排气冲程。

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The 400 IM not only requires strength and speed in all four strokes, but also tremendous endurance.

对于每种泳姿而言，400米个人混合泳需要的不仅仅是力量和速度，同时耐力也是至关重要的。

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Phelps is one of the world's best in all four strokes: freestyle, backstroke, breaststroke, and butterfly.

菲尔普斯在自由泳、仰泳、蛙泳以及蝶泳四种姿势中都是世界泳坛领军人物之一。

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The scientists said the results would be thirteen percent fewer heart attacks, eight percent fewer strokes, four percent fewer deaths and eleven percent fewer new cases of heart disease.

VOA: special.2010.03.03

Eight percent fewer strokes. Four percent fewer deaths.

VOA: special.2010.01.27

Woods finished Saturday's round at 3-under par, four strokes off the lead.

CNN: Woods penalized two strokes for rules violation

His intent to make good on that slip-up was clear in Brazil as he blew away the previous course best by four strokes.

BBC: Lonard rampant in Rio

In most spark ignition engines, a thermodynamic cycle occurs when the piston completes four strokes within the cylinder, and the crankshaft completes two revolutions.

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