two poleadj.两极的twonum.二；两个two-way radio communication双向无线电通讯two-channel recording paper二导程记录纸two-wheel inverted pendulum两轮式倒立摆two demensional array grammar二维阵列文法two-dimensional delay chain二维延迟链two-stage regression method两段回归法two-demineralization system双级除盐装置two dondition signalling code两态信号码two thousand and ninety seven(=2097) 二千零九十七two-bar thoracolumbar brace双杆式胸腰椎支具