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du.alH5djU:7El, $5dU:7[ladj [before n; not gradable]with two similar parts or combining two things双的;双重的This room has a dual purpose, serving as both a study and a dining room.这间屋子是两用的，既作书房又作餐厅。The dual role of chairman and chief executive is not unusual in the publishing business.既作董事长又作行政主管的双重身份在出版业并非不常见的。A car with dual controls has two sets of controls such as BRAKES, one for the person who is learning to drive and one for the teacher.双重控制(一种用于上驾驶课的车，教师可操纵离合器和制动器)Someone with dual nationality/citizenship has the nationality of two countries at the same time.双重国籍dual British and American nationality英国和美国的双重国籍(Br) A dual carriageway (Am and Aus divided highway ) is a road which has an area of land in the middle, dividing the rows of traffic which are moving in opposite directions.复式车行道If something is dual-purpose, it can be used to do two things.两用的;双重目的的a dual-purpose lawn-raking and leaf-collecting machine既能耙草又能收集叶子的两用机器
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