Some movements involving primarily vertical or horizontal motions of the body as a whole, in which rotations can be ignored, can be studied using simple equations of linear motion in three dimensions.

有些运动主要涉及整体的垂直或水平运动，其中转动可以忽略，可以用三维线性运动的简单方程来研究。

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In this paper a set of simple equations are taken as the basis for determining Z1.

本文提出以一组简单公式作为选择z_1的依据。

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Simple equations for calculating the winding ratio ensuring the minimum weight of spring are provided.

同时给出了弹簧重量最小时旋绕比值计算的简单的显函数公式。

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- There are a few equations that you need to memorize -- those are the very simple -- very, very simple equations, such as e equals h times nu -- hopefully you don't have to sit down and try to memorize that, hopefully we all know that already.

只有几个公式是需要记住的-,它们都非常简单，非常非常简单，比如，E，等于，h，乘以，ν,希望大家不需要再专门去背了，希望我们已经都记住了。

麻省理工公开课 - 化学原理课程节选

They should be able to carry out simple equations and algebra, calculate in fractions and percentages, calculate angles and understand probability.

BBC: What do Sats test levels mean?

While many individual quintic equations can be solved, there is no simple formula that deals with them all.

ECONOMIST: The history of mathematics