Based on the hopping characteristics of kangaroos, a spring-mass model of hopping kangaroo robot is developed.

根据袋鼠跳跃运动的特点，建立了仿袋鼠机器人的弹簧—质量模型。

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A two-mass model of the vibration compacting roller and its frame is established with consideration of materials asymmetrical hysteresis.

考虑被压实物料的不对称滞回特性，建立了振动压路机振动轮-车架系统的二质量运动模型。

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In this paper, the stiffness matrix has been obtained by the direct stiffness method, and the mass matrix, by the condensation mass model.

本文采用直接刚度法得到刚度矩阵，用聚缩质量模型得到质量矩阵。

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Tesla is also moving closer to finalizing its production facilities in Fremont, Califronia, where it will mass produce its Model S and its coming Model X, a cross over.

FORBES: Tesla More Than Doubles Revenue But Drops On Earnings Miss

The result was vastly increased productivity, opportunities, and even a new type of business model (mass customization) that otherwise would not have come into being under the Post Office monopoly.

FORBES: Private Currency Competition Is The Monetary Answer

Mr Sarkozy may be happy to mock a model that produces mass unemployment, but Mr de Villepin believes that tinkering is enough.

ECONOMIST: A prime minister who is doing better than many had expected