confined aquifers

基本解释

There are three types of aquifers: perched, unconfined, and confined.
含水层有三种形态，分别是上层滞水、潜水和承压水。
In the United States, the problem isn't confined to surface waters. Pharmaceuticals also permeate aquifers deep underground, the source of 40 percent of the nation's water supply.
在美国，这个问题并不仅局限于地表示。药物还会扩散到深入底表下的地下蓄水层；那里是全国40%的给水来源。
bbs.chinadaily.com.cn
But Dr Kharaka nevertheless suggests that the sequestration of carbon dioxide should be confined to deep aquifers, where overlying layers of shale would be likely to prevent leaks.
但是，Kharaka博士依然建议，二氧化碳的固存应该局限于深蓄水层，这些蓄水层上方有很多层页岩叠加在一起，可以防止泄漏。