The regional ecological system is fragile. 區域生態(tài)系統脆弱。
The ecology system will be broken if too many trees were felled. 過(guò)度砍伐樹(shù)木會(huì )破壞生態(tài)系統。
Cephalopod belongs to an important economic mollusk and also plays an important role in the marine ecological system. 摘要頭足類(lèi)不僅是重要的經(jīng)濟軟體動(dòng)物，同時(shí)在海洋生態(tài)系中扮演著(zhù)重要的角色。
If the species of the original system have been lost or invaders have appeared, the former pristine conditions may never be regained. 如果原本生態(tài)系中的物種消失了，或有外來(lái)物種入侵，這個(gè)生態(tài)系可能永遠無(wú)法回復原貌。
