位置线

For the future situation after stop line changed，the line-clothoid-clothoid-line model is presented.

对于停车改变后的未来状态，给出了直—回旋—回旋—直组合的左转车辆行驶轨迹模型。

Methods X-ray dental film and panoramic pantomogram were used to determine the location of embedded supernumerary teeth on bases of the geometrical principle of X-xay photography.

方法通过拍摄X牙片及全片,结合临床检查,利用X射照相中的几何学原理确定多生牙的,以确定手术入路,然后拔除。