当鼠洞垮塌卸料时，落下的材料常常在出料口上方变得致密而形成拱弧。
While some material may discharge as the rat hole collapses, falling material often gets compacted over the outlet and forms an arch.
当鼠洞垮塌卸料时，落下的材料常常在出料口上方变得致密而形成拱弧。
While some material may discharge as the rat hole collapses, falling material often gets compacted over the outlet and forms an arch.
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