Many nations have already verified that the impact of letting earthworms improve soil quality is startling. "It is the world's greatest fertilizer producer," says Kuo Teng-chih, a teacher at the Hsin-chu Teacher's College.
今天，許多國家已證實，以蚯蚓改良土壤，效果奇佳，「它是最偉大的堆肥製造者」，新竹師範學院數理系副教授郭登志說。