在他身后，一长串汽车和公交车都在慢慢移动，像极了他在用一根无形的铁链，牵引着整个车流往前。
When the horns began to sound, he rose from his seat and pedalled; behind him, a long line of cars and buses moved, as if he were pulling the traffic along with an invisible chain.
在当代，装备精良(同样也很昂贵)的汽车，诸如稳定控制系统和牵引力控制系统之类的电子系统，与防抱死系统相结合，有助于防止事故的发生。
In a modern, well-equipped (and often expensive) car, electronic systems like stability and traction control, along with anti-lock braking, will kick in to help the driver avoid an accident.
首先来看汽车的牵引系统。
Start with what is known about the vehicle's traction system.
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