This process gives your vehicle the best chance of holding traction on the steep hill, because both the gearbox and the brakes are locking you in place.
以上一系列操作会让你的车子尽可能在陡坡上保持住牵引力，因为此时变速箱和制动器都起到了锁定车辆的作用。
n. [车辆][机][外科]牵引；牵引力
drawing、
hauling power