In the course of extensive researches it was found that water stored underground kept its temperature well.
在广泛研究的过程中发现储存在地下的水能很好地保持着它的温度。
There are a lot of the environmental problems in course of groundwater exploitation: underground water table has sustained to decline;
河北平原是我国严重缺水地区 ，但在地下水开发过程中 ，引起了多种环境问题 ，如地下水位持续下降 ；
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