groundwater pollution etc 地下水污染等
It has many advantages: high yield, no circumstance pollution etc.
该方法不仅产率高，而且还避免了环境的污染。
Forest is playing a vital role in maintaining natural ecological balance, improving ecological environment, preventing and remedying pollution etc.
森林在维持自然生态平衡、改善生态环境、防治污染等方面具有极其重要的功能。
Thyristor cascade control system is a low-cost system, but the traditional cascade control system has some shortages, such as a low power factor, serious harmonic pollution etc.
晶闸管串级调速系统是一种廉价、简易的调速系统，但是传统串调系统存在着诸如功率因数低、谐波污染严重等弊端。
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