the ground floor

剑桥词典

the floor of a building that is at the same level as the ground outside
底層，底樓，一樓（建築物與外麪地麪相平的一層）
My office is on the ground floor . 我的公寓套房在底層。

例句

• His office is on the ground floor .
• It's really dark on the ground floor .

習語

be/get in on the ground floor 返回 the ground floor