求翻译：3 downhill brake failure, the body can not use the vehicle itself to control the speed, the driver should be bold and use of natural obstacles, such as roadside rocks, trees, etc., to the resistance caused by vehicles. If you can not find a suitable terrain, objects can be used in emergency situations can be the side of the body closer to the hillside, to increase the resistance to friction, gradually reduce the speed.是什么意思？

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