可采用多种钢轨廓形，使每种廓形与车轮均有一定数量的接触点，可以提高导向性能和总体的车辆运行质量，从而减少噪声和振动。
Use of a variety of rail profiles with a range of contact points improves steering and overall ride quality, and thereby reduces noise and vibration.
介绍了一种针对用三角形网面表示的不规则物体的碰撞检测中接触点，接触法线和刺穿深度的计算方法。
This paper introduces a method for calculating the contact point, contact normal and penetration depth in collision detection of irregular objects expressed by triangle mesh.
滑动板上的两个火线触点为平面形的，使拧装灯泡时阻力小不易损坏；
Two live wire contacting points on the sliding plate are in flat form, which reduces resistance force when the bulb is screwed, and the bulb is uneasy to be damaged.
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