长江中上游地区马尾松林的分布非常广泛。
The distribution of Masson Pine forest is very wide in the upper ana middle reaches of Yangtse River.
严重的泥沙淤积，反映出长江中上游地区土壤侵蚀十分强烈。
Serious silt accumulation reflects the intensive soil erosion in the upper and middle Yangtze River.
加快推动长江中上游地区和俄罗斯伏尔加河沿岸联邦区的合作。
We should accelerate cooperation between regions on the upper and middle reaches of the Yangtze River and their counterparts along Russia's Volga River.
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