隧道装载机 tunnel loader
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此外，一条长达50公里的隧道必然要挖出大量的土方，需要大量的卡车装载运出，诸如此类的事件都使得隧道很容易被发现。
Added to this that a tunnel would have to be about 50 km long and that the removal of earth would require a fleet of trucks etc it is liable to detection.
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