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.
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.
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。
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