常見例句雙語例句The annual and biennial herbs and xerophytes were dominant in every degraded stage of grassland, and played important roles in maintaining stability and ecological function of the community.草地退化過程中物種、功能群組成的變化，基本反映草地生態(tài)系統(tǒng)退化、群落結構簡單化和環(huán)境基質穩(wěn)定性減弱等一系列植被與生境系統(tǒng)變化的趨向。 返回 biennial grassland