Along with building Three Gorges Dam and exploiting the reservoir area, it is very important to strengthen studying environment evolvement of middle and upper reaches of Yangtse River.
随着三峡大坝的兴建和库区的开发，加强对长江中上游环境演变的研究就显得非常重要。
The distribution of Masson Pine forest is very wide in the upper ana middle reaches of Yangtse River.
长江中上游地区马尾松林的分布非常广泛。
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