The coefficient of friction for that same tire in mud would be almost zero.
同样的轮胎在泥泞的地面上，其摩擦系数可能几乎为零。
Kim easily dealt with hiking along an open sewage ditch, spring with a car tire strapped to her back, floating for half an hour in frigid ocean waters and rolling commando? Style in mud.
沿着露在地面的下水道沟徒步行走，背上绑着汽车轮胎全速奔跑，在冰冷刺骨的海水中漂流半个小时，在泥浆中像突击队队员那样摸爬滚打，这些金都都能应付自如。
Our Sunday drives, interrupted now and again by a flat tire or by getting stuck in the mud, opened the world to us.
世界在我们的周日乘车旅行中向我们敞开，虽然我们偶尔也会遇到瘪胎或在烂泥中抛锚。
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