front crossbar（前横梁）是什么意思？音标发音+图解场景

前横梁 /ˈfɹʌnt ˈkɹɒsbɑː/ n

English: front crossbar · 前横梁

释义：Crossbar in front of the harness that strengthens the frame; the lacing is attached to it.

这个词出现在以下图解场景（1）