A cusp is also called a stationary point or point of retrogression gression. 尖点也叫做平稳点或逆行点。
The amount of track points, including the double cusp points, which could be mostly realized by this kind of synthetic problems, was analyzed. 分析了包括双尖点在内，该类综合问题最多能实现的轨迹点数目。
