Erosion, which may include undercutting, knick point migration, headward erosion and downcutting, continues but at a much reduced rate.是什么意思_Erosion, which may include undercutting, knick point migration, headward erosion and downcutting, continues but at a much reduced rate.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句