研究人员说，他们分析的钻井是已经采用水力压裂法完成的，但是，岩层破裂是否可能正在导致污染，这个问题还要更多的过程研究才可以理解。
The researchers said the Wells they analyzed had been hydraulically fractured, but that more study of that process was needed to understand whether fracturing might be causing the contamination.
如果预计到只能通过钻井、挖掘或运送的方法获得水源，那这个地点就不能选择：因为钻井有可能不现实或者不能提供足够的用水。
A site should not be selected on the assumption that water can be acquired merely by drilling, digging, or hauling. Drilling may not be feasible and may not provide adequate water.
盐穴就是在地下盐层中通过钻井，利用水循环的方法，将盐层溶解，最终形成一个体积较大的空洞。
Salt caverns are underground cavity formed by drilling and water circular melting salt in underground salt layer.
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