播放线路
更新至20200974期
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剧情介绍
这地下的岩体基本呈现锥形分布，上面窄，下面宽。因此，水平直线并不是最短。只有斜着向上，才能最快的脱离岩层的区域。而且。斜坡形的通道，也能够让挖掘出来的碎石顺着通道泄下。...
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