two poleadj.两极的twonum.二；两个two-level management system二级管理two-dimensional Otsu method二维Otsu方法two - dimensional threshold二维直方图two-phase bridge connection二相电桥连接two - phase turbulence flow两相流twoslumping arches assumption双塌落拱假定two-layer routing algorithm双层路由算法Two half figures stand ashore两个半的轮廓站立在岸上two phase anaerobic digestion两相厌氧消化two-dimensional calculation二维计算