片语
balance of nature detail自然界平衡
keep a balance of nature生态平衡
keep the balance of nature保持生态平衡
a balance of nature生态平衡
keep balance of nature保持生态平衡
the balance of nature生态平衡
upset the balance of nature打破生态平衡
damage the balance of nature破坏生态平衡
balance e of nature生态平衡