Erosion-reducing Effects and the Temporal Changes thereof Concerning Different Types of Vegetations in Semi-arid Loess Hills and Gullies是什么意思_Erosion-reducing Effects and the Temporal Changes thereof Concerning Different Types of Vegetations in Semi-arid Loess Hills and Gullies在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句