双循环
circulation───n.流通，传播；循环；发行量；（图书的）借出
dual───vt.把……改为双幅车道；n.（Dual）（法）迪阿尔（人名）；adj.双的；双重的；n.双数；双数词
circulation system───环流系统；[医]循环系统；流通体系；流通体制
dual carriageway───双行道；[交]双线车道；双程分隔车道；n.<英>（中间有分隔带的）复式车行道
dual flow───双流
dual problem───[数]对偶问题；成对问题，对偶问题
dual carriageways───n.<英>（中间有分隔带的）复式车行道( dual carriageway的名词复数 )；双行道；[交]双线车道；双程分隔车道
circulation area───[建]流通面积
dual slim───双重修身
Dual string provides a new fluid circulation way and accelerates the velocity of liquid quickly, improving the efficiency.───双层管柱提供了新的液流通道，同时加快了携砂液返速，提高冲砂效率。
circulation of its dual-currency credit card reached 10 million by the end of 2006, a jump of 100 percent from 2005, and accounted for 35 percent of the credit card market in China.───招行透露，双币卡的流通卡数截至去年年底达到1000万张，比2005年翻了一番，占国内信用卡市场的35%。
water resources system of basin is the complex system of human and natural water circulation, and dual complex character becomes the intrinsic property of water circulation.───流域水资源系统是自然和人工水循环的复合系统，二元复合特性成为水循环的固有属性。