first floor

US /ˌfɜːrst ˈflɔːr/
UK /ˌfɜːrst ˈflɔːr/
"first floor" picture
1.

tầng một

the floor of a building at ground level or immediately above the ground floor

:
The office is on the first floor.
Văn phòng ở tầng một.
Take the elevator to the first floor.
Đi thang máy lên tầng một.