extension
/ɪkˈstenʃ(ə)n/📚 3218 40 2四级六级考研托福雅思高考An extension is a new room or building that is added to an existing building or group of buildings. (已有建筑或建筑群的) 延伸建筑
noun [抽象名词]延伸,扩展;展期,延长期;扩建部分,延伸部分;(电话)分机;扩展名;(为非全日制学生开设的)进修部;牵伸(术);外延;广延(性)
An extension is a new section of a road or railway that is added to an existing road or railway. (已有公路、铁路的) 延长路段
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