Downstairs means situated on the ground floor of a building or on a lower floor than you are.
She repainted the downstairs rooms and closed off the second floor.
她重新粉刷了楼下的房间,并把二楼封上了。
If you go downstairs in a building, you go down a staircase towards the ground floor.
Denise went downstairs and made some tea.
丹尼丝下楼沏茶。
If something or someone is downstairs in a building, they are on the ground floor or on a lower floor than you.
The telephone was downstairs in the entrance hall.
电话在楼下的门厅里。
The downstairs of a building is its lower floor or floors.
The downstairs of the two little houses had been entirely refashioned.
两座小房子的底层已彻底翻新过了。