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目的构建癌胚抗原（CEA）与热休克蛋白70（HSP70）的真核双表达质粒，并检测其在体外的表达。
Objective To construct the eukaryotic coexpression plasmid encoding carcinoembryonic antigen(CEA) and heat shock proteins 70 (HSP70), then detect the expression of the plasmid in vitro.
这台机器人脖颈处有双接缝，有助于他表达更多情感。
The robot features a double jointed neck that helps it achieve more expressive postures.
用双代数形式表示的不变量具有简洁、具体的表达式，可以由图像点坐标和基础矩阵直接求出。
The invariants of double algebra's form has simple and explicit expression which can be computed directly by coordinates of image points and fundamental matrix.
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