Definition: a level of a building Level: B2
我们的办公室在一栋三层楼里。
Our office is in a three-___storey building.
这座图书馆有五层，包括一个屋顶花园。
The library has five ___storeys, including a rooftop garden.
这座博物馆是单层结构，内部空间宽敞。
The museum is a single-___storey structure with a spacious interior.
