optional member  可选成分; 任选成员

Member 3 of Qingshankou Formation-Member 1 of Nenj  青山口组三段－嫩江组一段

the 2nd Member of Shanxi Formation—the 8th Member of lower Shihezi Formation  山西组二段—下石盒子组八段

the second sub-member of the third member of the Shahejie Formation  沙三二亚段

Type of vessel member dimension of member  导管分子类型

Ⅰ-type optional increasing paths  Ⅰ型可选增道路

Additional for Optional Destination  选卸港附加费

baskeball optional course  篮球专选

bead seat optional contours  可选择的胎圈座轮廓

bilateral optional forward contracts  双边可选择远期合同

contextually optional element  前后文选项元素

contextually optional token  前后文选项符记

dual mode time-optional control system  双重模时选控制系统

Dual optional and predictable projections  可选可料对偶投影

engineering optimizational method  工程优化方法

essential optional service  基本选项服务

fuzzy optional model  模糊识别模型

general optional course  公共选修课

inherently optional token  固有的可选符记

licensed optional material  特许任选材料