two portadj.四端的(二端对的)twonum.二；两个two thousand two hundred and eighty four(=2284) 二千二百八十四two-lobed epitrochoid rotary mechanism双弧外旋轮线旋转机械two thousand four hundred and twenty one(=2421) 二千四百二十一two thousand four hundred and twenty two(=2422) 二千四百二十二two thousand four hundred and sixty four(=2464) 二千四百六十四two thousand two hundred and fifty three(=2253) 二千二百五十三two-channel radiotelemetrical detector双通道无线电遥测检测器two thousand nine hundred and thirty one(=2931) 二千九百三十一two thousand two hundred and thirty nine(=2239) 二千二百三十九two thousand three hundred and sixty six(=2366) 二千三百六十六