高阶等差数列 arithmetic series of higher order: 高阶算术级arithmetic progression: 等差级数;算术级数; 等差列; 等差数列(等差级数); 算术级数;等差级数arithmetic progression (sequence): 等差数列arithmetic progression(sequence): 等差数列sum of arithmetic progression: 算术级数的和下载手机词典可随时随地查词查翻译