"Huan jing bao hu." . . "環境保護" . "Zi ran bao yu." . . "自然保育" . . . "Sheng tai xue." . . "生態學" . . . . . . . . "生態平衡與自然保護" . . . . . "Sheng tai ping heng yu zi ran bao hu" . . "生态平衡与自然保护" . . . .