installation and modulation

• 水位

installation and modulation的用法和样例：

例句

1. The dammed stream backed up and flooded the meadow.
   被坝堵住的河流水位上升，淹没了附近的草地。
2. The battery's quite low, and needs some distilled water.
   蓄电池水位相当低了，需要加些蒸馏水。