If earthworms could be raised in polluted soil, and then after a time moved out, even if the total amount of heavy metals in the environment was not changed, the land could be improved in this way, and the speed at which heavy metals are "passed on '' could be increased, thus lowering the recuperation time for the land.
如果可以在汙染土壤中養蚯蚓，過一段時間，再將蚯蚓移出，即使大環境中重金屬量未改變，土壤卻因此可以得到改良，重金屬的「代謝」增快，也可以縮短土壤的生病期。