double plate（顶梁板）是什么意思？音标发音+图解场景

顶梁板 /ˈdɔːsəm ɒv ˈnəʊz/ n

English: double plate · 顶梁板

释义：Level double member attached to the top ends of the studs; it also supports ceiling joists and rafters.

这个词出现在以下图解场景（1）