美国医疗支出中用于行政费用的比例大约是其他富裕国家的三倍。这是一个简单句,主语为The share of u.S.healthcare spending devoted to administrative costs,系动词为is,表语为roughly three time ghat it Is other affluent countries o文常来国费不器表示倍数的句型归纳:①倍数as+形容词或副词原级+as如:This bridge is three times as long as that one.这座桥是那座桥的三倍长。②倍数+形容词或副词的比较级+than,如:This bridge is three times longer than that one,这座桥是那座桥的三倍长。③倍数+the size/length/weight…++比较对象x如:This bridge is three times the length of that one这座桥是那座桥的三倍长。如:The college is twice what it was 5 years ago所大学是它五年前的两倍大。