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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Compared with one-mass and four-mass models, two-mass model is simpler and more rational, and its result accords well with experimental result.

与单质量和四质量模型相比，二质量模型结构合理，计算稳定性好，计算结果与试验更加吻合。

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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