biqi彼其Bin.[化]元素铋(bismuth)的符号bi-: pref.；表示“二；双”bivariate distribution二元分布,双变量分布,二维分布birefringence gradient双折射梯度bi-sphere scattering双球散射Bilitary tract surgery胆道外科手术biaxial eccentric load双向偏心受压Bipartite Ramsey number二部Ramsey数birational automorphism双有理自同构BIPV building designing光伏建筑一体化设计bimodal cross-bedding双向交错层理Bipartite Lozenge Chain双向棱型链