复曲线（compound curve）指的是两个或两个以上半径不同，转向相同的圆曲线内切或者外切相吻接而形成的平曲线。分有三类：1、单纯由圆曲线直线相连组成的；2、两端有缓和曲线中间用圆曲线直接相连组成的；3、两端有缓和曲线中间也由缓和曲线连接组成的。
回复曲线 recovery curve ; Return Curve
三心复曲线 Centered Compound Curve Centerline ; Three-Centered Compound Curve
压力恢复曲线 build-up curve ; up curve
最终压力恢复曲线斜率 final buildup slope ; FBS
复曲线积分 complex curve linear integral
重复曲线 repeated curve
复曲线点 point of compound curve
复曲线相关 multiple curvilinear correlation
复制曲线 Duplicate Curves ; facsimile log ; Duplicate Surface Curve
H反射恢复曲线 H reflex recovery curve
中插缓和曲线是工程中常见的一种缓和复曲线的组成部分。
Insert transitive curve is a common component curve in engineering.
单凸轮连杆组合机构可克服上述缺点，即可以方便地再现预定轨迹并有精确解，但其缺点是难以实现内凹曲线的轨迹复演。
Single CAM linkage mechanism can overcome the shortcomings mentioned above, however the new problem is that the mechanism can not generate the path which has concave curve.
本文把在单连通区域上成立的曲线积分与路线无关性定理推广到复连通区域。
In this paper the theorem in which a curve integral is independent of the integral path on a single connected region is generalized.
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