Hilly - gullied Loess region is the most fragile and underdeveloped area of the Loess Plateau.摘要黄土丘陵沟壑区是黄土高原生态环境极其脆弱,经济发展十分落后的地区....

gullied的音标：...

v.溪谷( gully的过去式和过去分词 )，（雨水冲击而成的）沟渠...