biyu比喻Bin.[化]元素铋(bismuth)的符号bi-: pref.；表示“二；双”bimodal current rose双向水流玫瑰图bipotential operator双位势算子bi-tech revolution生物技术革命Bienvenue a Paris.欢迎来到巴黎。birational invariant双有理不变量bicyclic hydrocarbon二环烃bicomponent spinning复合纺丝法biaxial eccentricity双向偏心bichromate treatment重铬酸盐表面处理biharmonic equations双调和方程