annexe
noun [ C ] UK (US annex) uk/ˈæn.ɪks/ us/ˈæn.ɪks/
附属建筑，附加建筑
an extra building added to a larger building
Delicate and valuable books are kept in an air-conditioned annexe to the main library. 贵重易损的图书存放在主图书馆的配楼里，那儿装有空调设施。
Synonym: extension
Compare: wing noun