mezzanine
US /ˈmet.sə.niːn/
UK /ˈmet.sə.niːn/

1.
tầng lửng, tầng trung gian
a low story between two main stories of a building, typically an intermediate floor between the ground floor and the first floor.
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The library has a beautiful mezzanine level with extra seating.
Thư viện có một tầng lửng đẹp với chỗ ngồi bổ sung.
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We watched the concert from the mezzanine seats.
Chúng tôi xem buổi hòa nhạc từ ghế tầng lửng.