二叠系底界：Permian base
二电子体系：double-electron
铒离子发光：Er 3+ luminescence
恶性B细胞：malignant B cell
二磷酸核苷：nucleotide diphosphate
二倍数规律：2~n-regularity
二次三角元：secondary triangular element
二维门限化：2D thresholding
二维坐标系：planar reference frame
二等三角网：the second order triangulation network
二次性发酵：two stage fermentation
耳蜗滤波器：Cochlear filter
二维全平面：whole plane
二维渗流场：Two-dimension seeage
二分法查找：dichotomy search
二维解析解：2-d analytical solution
二值计算机：binary computer
二未确知数：2 unascertained number
二元配套系：A complete set of dualistic lines
二十面体群：icosahedral group
耳下腺损伤：Parotid gland
额眉区层次：course of frontal and eyebrow regions
额眉区手术：operation of frontal and eyebrow regions
恶病质因子：cachexia factor
二重树编码：Duplicate tree coding
二极管列阵：diode-array
二次型分布：quadratic forms
二阶矩模拟：second-moment modelling
二层凸规划：bilevel convex programming
二步培养法：Two stage culture method
二细胞阻滞：2 cell block
耳头甲螨科：Otocepheidae
厄米特函数：Hermite function
恩开断裂带：Enkai fault zone
二硫键氧化：disulphlde bonds oxidizing
二量化反应：Two-quantitative reaction
二叠系储层：Permian reservoir rocks
二项式级数：the binomial progression series
二阶亚线性：Second order sublinear
恩格尔函数：Engel function
恩格尔模型：Engel model
二阶连续模：Second order modulus of continuity
二重复方法：double complex method
二分检索表：Dichotomous key
儿童杂事诗：Miscellaneous Children Poems
二次击穿区：the secondary breakdown region
二色性光谱：dichroism spectra
二分量孤子：Twoconponent soliton
二维等效势：equivalent 2D potential
二进制转换：binary conversion