根据我的记忆，水往复地变化，从湖泊和海洋里的水变成水蒸气，然后当它以雨或雪——也就是降水的形式落下时又变成水。
From what I remember, water changes back and forth from water in lakes and oceans to vapor, and then back to water again when it falls as rain or snow, as precipitation.
这感觉糟糕极了，就像是绕着运动场循环往复地奔跑。
It does not feel good, and it is like running around the playground, circularly, constantly.
无极绳调度绞车是利用钢丝绳循环往复地牵引固定在钢丝绳上的车辆或其他装备前进，能有效解决矿井辅助运输问题。
The endless-rope dispatching winch tows the tram cars or other equipments which are fixed on cable wire to solve the problem of assistant conveyance of mines.
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