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来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/21 09:22:48
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The earthworm is a useful animals. Out of the groud it is food for other animals . Inthe groud if makes rich soil for fields and gardens . Earthworms dig tunnels that loosen the soil and make it easy for air and ater to reach the roots of plants . These tunnels help keep the soil well and cause water to run geadually, that is ,to keep the soil not too wet and not too dry . Earthworms darg dead leaves, grass and flowers into their tunnels--their homes. Whenthese plant materials rot away,they become fertilizers. No other animals are so useful in building up the topsoil.It is found that in one year fifty thousand earthworms carry about 18 tons of fine soil to thr surface of one acre of land. One worm may add about 340 grams earth to topsoil.
蚯蚓是种益虫,在地上,它是其他动物的食物,在地里面它们把田野花园的土壤变得肥沃起来.蚯蚓在地里面挖的“隧道”松软了土壤,使得空气和水分能够充分地抵达植物的根部,这些小隧洞保证了土壤的质量,让水分逐渐流淌,从而使得土壤既不太干,也不太湿.蚯蚓把落叶、枯草和掉落的花拖到它们的隧洞里——那是它们的家园.那些植物腐烂掉之后就变成了肥料.在构造表层土壤这一方面,其他的动物可没有蚯蚓这么有功劳.研究发现,一年的时间里,五万只蚯蚓能够给一英亩的土地表层带来约18吨的优质土壤.一只蚯蚓大概给地表增添约340克的土壤.