1.After 15 years of construction work,the 9.5-meter wide tunnel bore machine will bore through the remaining 1.5 meters of rock to join two ends of the tunnel some 2,000 meters under a mountain.经过15年的施工，9.5米宽的全断面隧道钻掘机将会钻穿最后剩下的1.5米的岩层，联通了位于山体下2000米的隧道两端。
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