离去角：汽车后端突出点向后轮引的切线与地面的夹角。
Departure Angle: back-end automotive primer highlights the tangent to the rear of the Angle with the ground.
介绍了测设和检验圆曲线的两种新方法：任意角夹角法和任意切线长支距法。
This paper presents two kinds of new methods for setting out circular curve: free angle and tangent length method.
这一点和圆心的连线平分这两条切线的夹角。
The line connecting the point and the center bisects the included Angle of the two tangent lines.
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