trussed arch（桁架拱）是什么意思？音标发音+图解场景

桁架拱 /ˈtɹʌst ˈɑːtʃ/ n

English: trussed arch · 桁架拱

释义：Arched girder consisting of two chords joined by a triangulated network of struts.

这个词出现在以下图解场景（1）