first floor
US /ˌfɜːrst ˈflɔːr/
UK /ˌfɜːrst ˈflɔːr/

1.
一樓
the floor of a building at ground level or immediately above the ground floor
:
•
The office is on the first floor.
辦公室在一樓。
•
Take the elevator to the first floor.
乘電梯到一樓。
一樓
the floor of a building at ground level or immediately above the ground floor