单词：water cycle
water cycle的用法和样例：
例句
- As we have already noted, the movement of water into the ground is part of the hydrologic cycle.我们已经说过，水向地下运动是水文循环的一部分。
- Many scenarios for global warming, for example, invoke a speedup in the hydrological cycle by which water evaporates and then comes down as rain.例如，全球气候变暖的许多现象引起了水文循环的加速，其形式是水分的蒸发上升，然后以雨的形式降落至地面。
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