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。
Freestyle, butterfly, back stroke and breast stroke are four commonly seen strokes in swimming competition.
自由泳、蝶泳、仰泳和蛙泳是游泳比赛中常见的四种泳姿。
Fuel efficiency equal to or better than four-strokes.
等于或优于四冲程燃油效率。
Fuel efficiency equal to or better than four-strokes.
等于或优于四冲程燃油效率。
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