The Beauforts had been among ther first people in New York to own their own red velvet carpet and have it rolled down the steps by their own footmen,....Beaufort家是纽约最早拥有自家红色天鹅绒地毯的人家之一。关键是，have it rolled down the steps by他们家仆人...怎么解释？roll down the steps什么意思？谢谢
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rolled down the steps by their own footmen——由他家仆人顺着台阶铺下来。地毯这个东西收起的时候是卷着的，铺的时候自然要滚动打开，而台阶是往下走的，这就是 rolled down 的来由。