同轴度公差评估的是轴线相对于基准轴线的偏差，而径向跳动公差则评估的是圆周线相对于同轴圆的偏差。
The coaxiality tolerance assesses the deviation of the axis from the datum axis, while the radial run-out tolerance assesses the deviation of the circumference line from a coaxial circle.
为了显示属于软件包的分类器属于，从每个分类器画一条线到里面有加号的圆周，这些圆周粘附在软件包之上(图9)。
To show what classifiers belong to the package, a line is drawn from each classifier to a circle that has a plus sign inside the circle attached to the package (Figure 9).
譬如，在几何学里我们必须假定，一个圆周的圈线是由无限多喝无限小的直线形成的。
Thus in geometry you are told to conceive the circumference of a circle as formed of an infinite number of infinitely small straight lines.
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