auxiliary shaft
... serrate 锯齿状的 service shaft 辅助竖井 sessile animals 固着动物 ...
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... by hand level 辅助平巷 by pass 绕道 by pit 辅助竖井 ...
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第一辅助洞没有斜井或竖井，施工辅助洞采用全射流纵向通风。第二辅助洞埋深大，洞体长，洞形断面小。
First, there is no slope hole or silo, the auxiliary hole of construction adopts longitudinal ventilation only by jet Second, it belongs to deep buried hole, long body, little shape section.
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