twocoreadj.双磁心的(双活性区的)twonum.二；两个two-survey method二次调查法two sided sequences双边序列two-step crossing二次过街two-way operation双向操作two-earner couple双职工家庭; 双职工夫妻two - element set二元集two photon emission双光子发射two-step ejection二次顶出two- party system两党政治two-dee cyclotron双D盒回旋加速器