two gaps二间隙twonum.二；两个two thousand one hundred and fifty four(=2154) 二千一百五十四two-deck portable recorder-receiver双卡便携式收录两用机two thousand one hundred and ninety two(=2192) 二千一百九十二two-way break-before-make contact双向先断后合触点two thousand six hundred and sixty nine(=2669) 二千六百六十九two-coordinate neutron diffractometer二坐标中子衍射仪two-step super-low acids hydrolysis二步超低酸水解液two thousand seven hundred and eighteen(=2718) 二千七百一十八two -year higher vocational education两年制高职two thousand five hundred and fifty two(=2552) 二千五百五十二