The spare tyre on the back of the Jeep was held fast by three strong bolts.吉普车后面的备用轮胎被三个坚固的螺栓牢牢固定住。All cars have to carry a spare tyre by law.根据法律规定,所有汽车都必须携带备用轮胎。This was sod's law: when the spare tyre is in use, you will have a puncture.这真是墨菲法则:一用备用轮胎,保准扎孔。Take a spare tyre along in case of need.带只备用轮胎去,以备不时之需。