extension
/ɪkˈstenʃ(ə)n/📚 3211 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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