The theory of slip-line field is an effective method for problems of plane strain of perfect plastic solids, and the circle-fan field is used frequently.
滑移线理论是解刚塑性平面应变间题的一种有效方法，而圆扇形场则是常使用的。
An axis external circle simulates a reference shaft line to realize the principle of the measurement of the plane to the symmetrical characteristic of the reference axis.
以轴外圆模拟基准轴线实现面对基准轴对称度测量的原理。
One is straight line or curve on the local plane. The other is the great circle flight path on the earth surface.
预定的飞行轨迹可以有两种规划方式，一是近似在当地切平面上的直线或曲线；
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