外模（external mold）是指保留于化石围岩上的生物遗体外表特征及表面纹饰的印痕，反映原来生物硬体的外表形态和构造特征，其凹凸情况与原物相反。 外模、内模和复合模，均属于印模化石。
双语例句原声例句
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介绍聚氨酯浇注轮胎成型系统的研究，主要包括芯模、外模及翻转架的设计和研制。
The research of the molding system for the castable polyurethane tire is introduced, mainly including the design and development of the core mold, outer mold and rotatable frame.
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采用二维轴对称弹塑性有限元法对比分析了不同外模模角和游动芯头锥角的配合对拉拔铜管的影响。
This paper focuses on the comparison of the matching of dies and floating plugs with different Angle with the aid of 2d axisymmetric elastic-plastic FEM and the influence of drawing copper tubes.
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在一定条件下，设计的滑动模控制律使得系统沿预先设计的滑动流形的滑动运动对系统的参数摄动和外干扰具有不变性。
Under certain conditions, the designed variable structure control law makes the sliding mode along a specified sliding manifold invariable to the system perturbation and external disturbances.
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It's good to have a vector pointing in the radial direction of length one.
所以引入这么一个模长为 1,方向沿圆心向外辐射的矢量作用很大
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er is a vector at each point of length one pointing radially away from the center.
r 是一个模长恒为 1 的矢量,方向沿半径向外
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