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1.descend 下；下降
She descended the stairs slowly.
她缓慢地走下楼梯。
2.abundant 丰富的
There is an abundant supply of cheap labour.
有丰富的廉价劳动力供应。
3.erosion 侵蚀
As their roots are strong and penetrating, they prevent erosion.
它们的根十分粗壮而且扎得很深，从而避免了受侵蚀。
n. 补给，供给，供应，贮备
vt. 补给，供
