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

1.
1층
the floor of a building at ground level or immediately above the ground floor
:
•
The office is on the first floor.
사무실은 1층에 있습니다.
•
Take the elevator to the first floor.
엘리베이터를 타고 1층으로 가세요.