The work was on a big scale and involved the boring of extra tunnels.
这项工作的规模很大，涉及到开挖额外的隧道。
This is the first study that has kind of done it on a big scale in a natural situation.
这是第一次在自然形式下做的大范围的研究。
This is the first study that has kind of done it on a big scale in a natural situation.
这是第一次在自然形式下做的大范围的研究。
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