two gaps二间隙twonum.二；两个two thousand six hundred and sixty four(=2664) 二千六百六十四two thousand nine hundred and fifty six(=2956) 二千九百五十六two thousand five hundred and sixty one(=2561) 二千五百六十一two-dimensional Gaussian distribution二维高斯分布two-part step-rate prepayment meter两部阶跃预付电度计two thousand one hundred and sixty nine(=2169) 二千一百六十九two thousand five hundred and seventeen(=2517) 二千五百一十七two thousand one hundred and ninety six(=2196) 二千一百九十六two thousand eight hundred and nineteen(=2819) 二千八百一十九Two times spline interpolation function二次样条插值函数