用最明显的图形来描述这个过渡的特性就是：当在两个圆之间绘制一条直线，直线与每个圆只有一个交点时，那么这条线就是两个圆的切线。
The quality of this transition is best visualized by a straight line drawn between two circles: the line's only point of contact with each circle is tangential.
我们还学过怎样理解直线方程，它们有些特性，因为我们是从参数方程角度理解。
Ok, we've also seen how to look at equations of lines, and those were of a slightly different nature because we've been doing them as parametric equations.
通过对磁场的分析，可以计算出直线感应电动机的运行特性。
By analyzing magnetic field, the operation characteristic of the linear induction motor was calculated.
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