tandem bicycle
双人───Double;单车───Cycling
He served 17 double faults.───他有17次双发失误。
He earns double what she does.───他挣的钱是她的两倍。
His income is double hers.───他的收入是她的两倍。
Tortured by his double life, Tong studied various medical books, trying to figure out what was wrong with him.───来自两种生活的折磨促使佟研究各种医学书籍，试图弄清楚他到底出了什么问题。
Some say a company like HP could easily double or triple 3PAR's sales in a few years, making it a smart deal.───还有人说，像惠普这样的公司能很容易地让3PAR的营收在几年内增长一倍或是两倍，证明收购3PAR是项明智交易。
The thought made anger rise in him and he went into a bar and had a double whisky.───这个想法让他怒火直冒，于是他去了一家酒吧，要了双份的威士忌。
No double diligence, neither can, no genius.
Pregnant women received a double ration of milk.
It costs double what it did.
King's was the only other score in double figures.
Single is simple, double is trouble.