two historical revolutions 两大历史变革
A cycle, remember, corresponds with two revolutions of the crankshaft.
记住,一个循环相当于曲轴旋转两次。
The wheel carried some 38,000 passengers daily, took 20 minutes to complete two revolutions, and cost 50 cents a ride.
此摩天轮每天供38000名游客游玩,只用花50美分就可以体验20分钟的两圈旅程。
By the time the crankshaft completes two revolutions, each cylinder in the engine will have gone through one power stroke.
曲轴转两周,发动机里的气缸完成一个作功行程。
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