水位上升，就会发生洪水。
当他们把一块石头扔进一个粗试管时，相连的一个细试管里的水位上升了。
When they dropped a stone into a wide tube, the water level raised in a connected narrow tube.
第二座大坝将湖面抬高了3.5米，而第三座大坝又让水位上升了30米。
The second dam raised the lake’s level by 3.5 meters (12 feet), and the third dam raised water levels by 30 meters (100 feet).
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