首先来看汽车的牵引系统。
Start with what is known about the vehicle's traction system.
一辆牵引车将汽车拖去修理厂。
当汽车直线行驶时，两个驱动轮有相同的牵引力。
When a car moves straight ahead, the drive wheels have an equal amount of traction.
当汽车直线行驶时，两个驱动轮有相同的牵引力。
When a car moves straight ahead, the drive wheels have an equal amount of traction.
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