裸地因降雨产生地表结皮，产流时间主要取决于降雨强度，两者的关系可用线性描述。

Surface crust could easily take place on bare land, so its runoff-yielding time primarily depended on rainfall intensity, and their relationship might be described by a linear function.

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用非线性振动方程描述了球摆在 z 方向上的运动。

The motion of spherical pendulum in z-direction is described by nonlinear oscillation equation.

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我们建立了一套描述聚丁二炔晶体中的三阶非线性光学过程的数学公式。

We derived a set of mathematical formulas for describing the third-order nonlinear optical process in polydiacetylene crystals.

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Obviously-- and that's a bad way of saying it, I said constant the previous time-- in the linear case, it's subtract by certain amount.

这么描述很不准确，我之前在，线性算法中也说了常数,它是每次减少固定的量。

麻省理工公开课 - 计算机科学及编程导论课程节选