drift（平巷）是什么意思？音标发音+图解场景

平巷 /ˈdɹɔːstɹɪŋ ˈbaɡ/ n

English: drift · 平巷

释义：Passageway dug horizontally along the grade line of the ore seam; it can also be dug into the ore vertically.

这个词出现在以下图解场景（1）