Degree sum conditions of ID-factor-critical graphs are studied.A lower bound for the degree sum of any two nonadjacent vertices such that G is ID-factor-critical is obtained,and the bound is sharp.是什么意思_Degree sum conditions of ID-factor-critical graphs are studied.A lower bound for the degree sum of any two nonadjacent vertices such that G is ID-factor-critical is obtained,and the bound is sharp.在线翻译_英语_读音_用法_例句