四套公寓住宅楼

例句：

1. 1. We live in a small apartment in the city center.
   我们住在市中心的一个小公寓里。
2. 2. She rented an apartment for her friend who is studying in another city.
   她为在另一个城市学习的朋友租了一套公寓。
3. 3. The apartment was very clean and well-kept.
   这套公寓非常干净，保养得很好。