With the tree cover gone, every rainy season sees more of the precious topsoil washed away into the lake.
随着植被覆盖面的消失,每次雨季都将更多的宝贵的表土层冲到湖里去。
2
He ordered tons of fertile topsoil to cover the grounds to a depth of five feet and full-grown specimens of the plants were trucked up the mountain for planting.