例句 /

Abstract: Characterized by vast coverage and extra intensity, soil erosion in the Upper Yangtze River Valley has become an important indicator of the ecological and environmental deterioration in the region.

Abstract: Characterized by vast coverage and extra intensity, soil erosion in the Upper Yangtze River Valley has become an important indicator of the ecological and environmental deterioration in the region.

文摘:长江上游水土流失面积广,侵蚀强度大,是其生态环境退化的重要标志。