side back vent（背部开衩）是什么意思？音标发音+图解场景

背部开衩 /ˈsaɪd ˈbak ˈvɛnt/ n

English: side back vent · 背部开衩

释义：Vertical opening with overlapping edges on each side of the back of a jacket, giving it fullness.

这个词出现在以下图解场景（1）