Trees do more than keep the soil in place. They also soak up water and prevent flash floods, and keep rivers clear of sediment that can kill fish.
树木所起的作用不止于保持水土。树木还吸收水份、防止洪水突发，并使河流不至于含有可杀死鱼类的泥沙沉淀。
Haiti's trees and roots used to keep the mountainous island's soil in place.
海地的树木和树根过去使这个多山岛国的土壤稳固。
Trees keep moisture in the ground by holding the soil in place to protect erosion.
树木固定土壤，防止侵蚀，从而保持地里的水分。
The trees hold soil in place. They also help keep the ground from getting too dry.
那些生长在庄稼中间的树可以保持水土，以免流失。
The trees hold soil in place. They also help keep the ground from getting too dry.
那些生长在庄稼中间的树可以保持水土，以免流失。
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