On a land vehicle the speed input is usually obtained from the speedometer drive system.
对地面运动体，输入速度通常由测速计的驱动系统来供给。
Only a madman would drive a juggernaut at full speed with a faulty speedometer, a cracked rear-view mirror and a misty windscreen.
只有疯子才会驾着一部速度计失灵倒后镜裂缝，前挡风玻璃雾蒙蒙的卡车，开足马力全速前进。
Only a madman would drive a juggernaut at full speed with a faulty speedometer, a cracked rear-view mirror and a misty windscreen.
只有疯子才会驾着一部速度计失灵倒后镜裂缝，前挡风玻璃雾蒙蒙的卡车，开足马力全速前进。
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