joist

US /dʒɔɪst/
UK /dʒɔɪst/
"joist" picture
1.

장선, 보

a length of timber or steel supporting part of the structure of a building, typically arranged in parallel series to support a floor or ceiling.

:
The floorboards were nailed directly to the wooden joists.
마루판은 나무 장선에 직접 못 박혔다.
We need to replace some of the rotten joists in the old house.
오래된 집의 썩은 장선 몇 개를 교체해야 한다.