In some places earthworms are helpful in making good soil. as they crawl through the earth getting their food, they make little tunnels that air and water come through.

在有些地方，蚯蚓有助于沃土的形成。蚯蚓在土壤中爬来爬去搜寻食物时，在土壤中钻出许多细小的孔道，便于空气和水分的流动。

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In some places earthworms are helpful in making good soil. as they crawl through the earth getting their food, they make little tunnels that air and water come through.

在有些地方，蚯蚓有助于沃土的形成。蚯蚓在土壤中爬来爬去搜寻食物时，在土壤中钻出许多细小的孔道，便于空气和水分的流动。

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