The three levels of nature conservation--protection, rehabilitation and management--all require more scientific investigation to be undertaken on the species in question, before one can correctly estimate the degree of protection required and the level of exploitation permissible to achieve the management ideal of sustainable use.
自然保育的三個層次，保護、復育、經營管理，都需要對物種進行更多科學的探索，才能確實評估保護、利用程度，達到所謂「利用、厚生」的永續經營的理想。