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[C] an extra room or rooms added to a building (建筑物)扩建的部分 We are building an extension on the back of our house. 我们正在屋后进行扩建。
extension to : He has applied for permission to build a single-storey extension to his house. 他已申请许可在他的房子里扩建一层。
Synonyms and related words