基本解释[土木建筑工程]落后山区英汉例句双语例句Baojing County which situated at the outlying mountainous area in Xiangxi, has a backward economical development.保靖县属湘西土家族苗族自治州，地处边远山区，经济发展落后，是国家级贫困县。a backward mountainous area更多例句专业释义土木建筑工程落后山区