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main fan /ˈmeɪn ɪlˈɛktɹɪk ˈməʊtə/ n

中文：主通风机

中文 · 主通风机Español · ventilador principalFrançais · ventilateur principal
Meaning：Device that ensures air exchange in the mine; air is drawn through one shaft and exits through another.
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Found in these illustrated scenes（1）

Mine shaft entrance

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