flat, apartment, condominium, block of flats, apartment house, apartment building, apartment block

flat指公寓大楼内(某一层楼上)供居住的一套房间，用于英国英语；而apartment与之同义，用于美国英语；condominium简称condo，多用于美语，指各套公寓均由私人所有的公寓大楼，为非正式用语，在英国称为block of flats，而在美国则称为apartment house, apartment building或apartment block。试比较：

a furnished flat家具齐备的公寓

a three-bedroom apartment三居室公寓

He wanted to buy a condominium.他想买一套房。

Several blocks of flats(或apartment buildings) were pulled down.几幢大楼被拆了。