twolinkn.两段线路twonum.二；两个two-hybrid assay双杂合(体)试验two orifice valves双小孔阀two-tone working双音工作two-port circuit双端口电路two or three years两三年two-pass drawing两道次拉拔two room two halls两室两厅two-way crossing二品种杂交, 二元杂交, 二品种杂种, 二元杂种two referee system两人裁判制two pulse canceler双脉冲补偿器