露天的矿坑也逐渐演变成这地下无尽的隧道网。

Open pits evolved into networks of underground galleries.

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场地下的铁路隧道网给该项目的兴建带来许多巨大的挑战。

The Network Rail tunnel beneath the site presents a number of significant challenges to the construction of the overall building.

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2015年，中国开始建造隧道网来减缓地下水需求的压力。

In 2015, China began to build a network of tunnels and canals to ease up the strain on underground aquifers.

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