锥状多段线线段 tapered polyline segments
多段线线段 polyline segments
曲线段分段输入 IFEND
段和线段的扫描线算法 SLA-BAL
多段曲线段 Multi-lobe
普通定义的积分是定义在一段线段上的，而线积分则用更一般的路径，像抛物线或圆。
An ordinary definite integral is defined over a line segment, whereas a line integral may use a more general path, such as a parabola or a circle.
用一段一段的红色的线段，把随机选择的钮扣，一对一对地连在一起。
Break off pieces of the red thread and tie a randomly chosen pair of buttons together by the thread.
并且证明，法面双圆弧齿轮的每一段端面齿廓都是对应椭圆曲线段在相对运动中的包络曲线。
Moreover, the extreme shape of the normal double circle gearing proves to be the involved curve of the corresponding ellipse.
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