The body of the earth-worm is covered with slime , which helps it to burrow in the ground, for its wet slimy body passes easily through the soft earth.

蚯蚓的身体外包裹着粘液, 这样可以帮助它在泥土中钻行, 因为黏滑、湿润的身体能够轻松地在柔软的泥土中穿梭。