将造波水槽内二维浮体牵引弹簧回复液压缸的受力系统简化为弹簧—质量—阻尼器系统，建立数学模型，并根据牛顿第二定律得到运动方程式。

The model of a kind of wave energy device moored on seabed is simplified into a spring-mass-damping system, and then its motion equation is built according to Newton's second law.

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文中推导了拉维娜式行星齿轮变速器的单排双行星轮式齿轮机构的运动特性方程式。

This paper derives the motion property equation of the one-row and two-planets gears for Ravigneaux planetary transmission.

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从上而下的方式容易些，不用担心模型的运动方面，你只要建立些方程式，重现秀丽隐杆线虫的行为就行了，这也是经济模型经常采用的方式。

Instead of worrying about how the thing being modelled works, you need only find some equations that reproduce its behaviour; economic models often work this way.

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By the way, if we go back to this, another big part of disease--chronic disease that's related to diet, is the physical activity part of the equation.

顺便一说 我们回过去看,大多数疾病,与饮食有关的慢性疾病,与一个关于肢体运动的方程式有关

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选