常見例句雙語例句Good intentions are rewarded with plenty of Nile perch (for now) but a degraded ecosystem in the long run.于是回報當(dāng)初人們的美好愿景的是，大量的尼羅河鱸魚和指日可待的環(huán)境退化。Layer structure, synusia structure and height- classes structure and dynamics of degraded ecosystem were studied.對退化生態(tài)系統(tǒng)的層次結(jié)構(gòu)、層片結(jié)構(gòu)、高度級結(jié)構(gòu)及其動態(tài)等進(jìn)行了研究。In this paper, the general situation of mountain ecosystem was briefly introduced and the effects of keystone populations on the degraded ecosystem were discussed.簡要介紹了岷江上游山地生態(tài)系統(tǒng)的概況，討論了關(guān)鍵種群在退化生態(tài)系統(tǒng)研究中的作用和意義。 返回 degraded ecosystem