水位达到一定高度时，水将推动一个控制杆，从而显示时间。
When the water reaches a certain level, it moves a lever and this shows the hours.
纽约城市土地是有限的，建筑物也只能延伸到一定高度。
There is only so much land in New York's urban areas and the buildings can only stretch so high.
湿度达到了一定高度，全国各地就会出现大范围多雾天气。
When the humidity is high, there will be foggy regions formed in many areas of China.
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