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。

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Compared with other countries, UHV power transmission in China is faced with some special problems, such as high altitude and heavy pollution etc.

与其他国家相比，我国特高压输电面临一些特殊问题，如高海拔和重污秽等。

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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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