密西西比河的水位已经比正常水位低6.5英尺。

The water level of the Mississippi River is already 6.5 feet below normal.

《柯林斯英汉双解大词典》

当水位高的时候，使用者只需要往下走几个台阶就能到达井的部位；当水位低的时候，就要走好几层了。

When the water level was high, the user needed only to descend a few steps to reach it; when it was low, several levels would have to be negotiated.

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由于湖泊水位是由蒸发率和降水量控制的，对这种水位的解释是模糊不清的。

Since lake levels are controlled by rates of evaporation as well as by precipitation, the interpretation of such levels is ambiguous.

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So, for example, we have this average level, and then it can go high where we have the peak, or it can go very low. We can also discuss sound waves, so again it's just the periodic variation of some property -- in this case we're talking about density, so we have high density areas and low density areas.

例如这是平均位置，在峰的位置水位高，在谷水位低，我们也可以,讨论声波它也是某种,量的周期变化，在这里我们,讨论的是密度,我们有高密度区和低密度区。

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