双鸟在林不如一鸟在手A bird in the hand is worth two in the bush
双尾检验two-tailed test
开郁二陈汤Depression-Opening Two Matured Ingredients Decoction
双向无线电通讯two-way radio communication【通信】
双维归因twodimension
双路传输two-way transmission【通信】
二历程学习论twoprocess learning theory
一维二相流one-dimensional two-phase flow【数】