And they protect against soil erosion by holding moisture in the ground.
树木还能保持水分防止土壤侵蚀。
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 low resistant erosion ability of ground substance, especially in granite weathering crust and purple rock and its soil are the inner causes of severe soil erosion.
抗侵蚀性较弱的地面组成物质，特别是花岗岩和紫色岩风化壳及其土壤，是造成土壤侵蚀特别严重的内在原因；
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