研究轴承部件缺陷引起轮对结构共振的特征及规律，建立数学物理模型；

Study the bearings parts blemish causes the round to the characteristic and regulations of the structure resonance, establishment mathematics physics model.

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与建造物理模型或者使用数学模型不同的是，软件设计者靠编写高层的代码来建立“模型”。

Instead of building physical models to scale, or using mathematical models, software designers typically "model" by writing high level code.

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在物理学家建立了一些数学模型去解释一些社会学家观察到的网络现象之后，这个领域大概在十年前开始兴起。

The field took off about 10 years ago, after physicists developed mathematical models to explain some of the network phenomena sociologists had observed.

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