ledger（搁栅横梁）是什么意思？音标发音+图解场景

搁栅横梁 /ˈlɛdʒə/ n

English: ledger · 搁栅横梁

释义：Level member located along a girder and supporting the ends of the floor joists.

这个词出现在以下图解场景（1）