twolinkn.两段线路twonum.二；两个two phase additive两相添加剂two-course range双航向信标two-level parser二级语法分析器two-stage method二级方法two-phase method两阶段法,二段法two colour tracker双色跟踪器,双色跟踪装置two-cycle scheme双循环电路,推挽电路two magma chambers双岩浆房two-foot jumping双脚起跳two-side copying双面复印