译：自然界的平衡在冻土带上是非常灵敏的，只要稍微有一点破坏平衡的现象出现就可能产生环境上的一些重大变化。 。
Thee balance of nature is so delicate on the tundra that even minor disturbances may produce major changes in the environment.
自然界的平衡在冻土带上是非常灵敏的，那怕只要稍微有一点破坏平衡的现象出现就可能产生环境上的一些重大变化。
The balance of nature is so delicate on the tundra that even minor disturbances may produce major changes in the environment.
另外，两个国家的偿付方式也完全不同。转制国家伴随着经济、社会的重大变革，他们的医保筹资体制也经历了非常重大的变化。
It's necessary to analyze transition countries separately since great changes have taken place in both their economy and their healthcare system.
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