在世界很多地方，大量的树木遭到砍伐，自然界的生态平衡遭到破坏。
In many parts of the world, large Numbers of trees have been cut down and the ecological balance of nature has been disturbed.
另一方面，旅游业已经对我们生存的环境造成了巨大的压力：水受到污染，生态平衡遭到破坏，自然资源被过度开发。
On the other hand, tourism has exerted great pressure on the environment we are living in: water is polluted, the ecological system is disturbed, and natural resources have been excessively used.
自然生态平衡遭到严重破坏，人为诱发的地质灾害发生越来越频繁。
The ecological balance of natural is damaged seriously, and human-induced geological disasters are increasingly frequently.
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