the action of tracking someone or something 跟踪,追踪 ■(Electronics)the maintenance of a constant difference in frequency between two or more connected circuits or components (电子)统调 ■the alignment of the wheels of a vehicle (车轮的)定位 ■the formation of a conducting path for an electric current over the surface of an insulating material (绝缘体表面的)漏电痕迹