The support frame (15) is preferably arranged on the front portion of the floor tunnel (11).
支撑架(15)配置在地板通道(11)的前端部是合适的。
Nelson picked his way along the tunnel, stepping around piles of broken stone and lumps of coal tumbled like black dice across the dusty floor.
Nelson沿着隧道小心前行，绕过成堆的碎石和许多块像黒骰子般滚落到粉尘地上的煤炭。
There was no floor in this tunnel: you had to step from rafter to rafter, and between them there was only plaster.
隧道里没有地板，你必须从一根椽子到另一根橡子，椽子之间只有灰泥。
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