两个非圆角表面相交处一般均做成圆角过渡，所以两表面的交线标的不明显，这种交线称为过渡线。
齿根过渡曲线 Fillet curve
在两条线的过渡生成线 Line Fillet
地面和地下管线过渡段 abovebelow ground transition
铜铝过渡设备线夹 SYG
过渡曲线干涉 fillet interference
段间过渡联线 transformer connection between disks
过渡曲线端点 TE Transition curve end
不幸的是，对于黄金来说，买多情绪只从那个过渡线拉回来一点点。
Unfortunately for gold, bullish sentiment has pulled back only slightly from those overheated levels.
这种快速的过渡地带被称为“上树带线”或“林木线”。
This rapid zone of transition is called the upper timberline or tree line.
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.
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