double densityˈdʌblˈdensiti短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 倍密度,双倍密度 EBCT features of wall thickening appeared as a concentric wall thickening or double density ring in10 patients with active disease and low density ring in7 patients with inactive disease. 活动期10例动脉管壁增厚呈环状高密度影或分层状，内壁光滑。非活动期7例管壁增厚程度轻，呈低密度环。 cnki