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隧道掘进技术是各种标准技术的组合,在过去的20年里几乎没有什么大的变化,但现在的趋势却是不断扩大隧道掘进技术的极限。Lawrence Williams报道。
Tunneling technology is a combination of a variety of standard technologies, with few major changes over the past two decades, but the trend now is to expand the limits of tunneling technology. Lawrence Williams reports.