Birz比尔兹Bin.[化]元素铋(bismuth)的符号bi-: pref.；表示“二；双”bifoveal fields of fixation双眼黄斑注视视野biparametric representation双参数表示birefringent quartz crystal石英晶体双折射bilirubin calcium gallstone胆石症bipartite permutation graph二部置换图biphotochromic spirooxazine双光致变色螺噁嗪biaxial spherical harmonics双轴球面调和函数biliverdin-dimethyl ester胆绿素二甲基酯bivariate normal population二变量正态总体biaxial tension polystyrene双向拉伸聚苯乙烯