过渡带地下水化学成分不是淡水和海水的简单混合，阳离子交换在其中起了重要作用。
The chemical composition of groundwater in the transition zone is not a simple mixture of local fresh water and sea water, in which the canon-exchange played an important role.
通过长期监测地下水中水化学成分的变化，就有可能为预测预报地震提供一种新的前兆信息。
Through long-term monitoring of the change of the chemical composition of groundwater, a new kind of premonitory information for earthquake prediction may be provided.
大量的开矿过程对含水层中的地下水循环和化学成分都造成了可观的变化。
Extensive mining progress caused considerable changes in both groundwater circulation and groundwater chemical composition of the aquifer.
甚至有些工厂释放出的化学成分进入气氛，然后随雨水降下进入水道，而且进入了咱们的地下水。
Certain plants emit chemicals to the air. The chemicals are then brought down by the rain and enter our groundwater.
甚至有些工厂释放出的化学成分进入气氛，然后随雨水降下进入水道，而且进入了咱们的地下水。
Certain plants emit chemicals to the air. The chemicals are then brought down by the rain and enter our groundwater.
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