真题例句：

• One problem with these sources is that the deep water also has a higher level of salt than shallower aquifers.

  这些水源的一个问题是深层水比浅层水含盐量更高。

  [2018年 CET4 阅读理解]

• The aquifers range from 1, 000 to 3, 000 feet below the ground, which means that pumping will be expensive and there are other concerns.

  地下蓄水层的高度在地下1,000到3,000英尺之间，这意味着抽水会很昂贵，以及其他的问题。

  [2018年 CET4 阅读理解]

• The team at Stanford investigated the aquifers (地下蓄水层) below this depth and found that reserves may be triple what was previously thought.

  斯坦福大学的团队调查了这个深度以下的地下蓄水层，发现储量可能是以前认为的三倍。

  [2018年 CET4 阅读理解]

真题例句：