Many cell phone companies use a two-leg billing system that bills each leg of the call separately.
许多移动电话运营公司都使用两档计费系统，分别对呼叫的每一档进行单独计费。
Its model involves a two-mirrored system that directs sunlight down an optical rod onto a small (1 square centimeter) photovoltaic cell.
它的模型有一个双面镜像系统。该系统直接把阳光投射进一块小型(1平方厘米大小)光伏电池的光学感应棒上。
The experimental evidence suggests that a particularly good way of activating the cell-killing arm of the immune system is to use two vaccines based on different antigens.
实验之中的种种迹象表明一个能够充分发挥免疫系统的抗病毒能力的方法，那就是同时使用两种能够辨认不同种类抗原的疫苗，一为主，一为辅，一种负责刺激免疫系统,使其做好攻击艾滋病病毒的准备;
Visualization study of two-phase flow in anode interdigital flow bed of a liquid-fed direct methanol fuel cell (DMFC) was performed in a home-made experimental system.
采用自制的实验系统对液态进料直接甲醇燃料电池（DMFC）阳极交叉指状流道内的两相流动特性进行了可视化实验研究。
The composite liner system was located under the low - permeability cell berm separating the two cells.
复合衬板系统位于下分开两个单元格的单元格低渗天然。
The performance of the liquid feed direct methanol fuel cell was tested in a self designed experimental system. Two self-made gold plated stainless steel polar plates were installed in the fuel cell.
本文利用自行设计的实验系统，对自制的镀金不锈钢极板液态进料直接甲醇燃料电池的性能进行了测试。
Part Two: to evaluate the linearity of photometry for measuring cell image of TIGER cell image analysis system.
第二部分：评估TIGER细胞图像分析仪测量细胞图像光度的线性。
Proteins were extracted from two cell groups, respectively. The maps of proteins were set up by DIGE system.
提取实验组和对照组细胞的总蛋白，应用荧光差异凝胶电泳系统（DIGE）获得差异蛋白点的表达信息；
Proteins were extracted from two cell groups, respectively. The maps of proteins were set up by DIGE system.
提取实验组和对照组细胞的总蛋白，应用荧光差异凝胶电泳系统（DIGE）获得差异蛋白点的表达信息；
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