Night falls on the famously well lit city, which spreads out over an underground labyrinth of immense scope and some danger.

夜幕降临在这著名的不夜城，灯光笼罩在范围广大的地下迷宫以及一些不安定因素上。

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The technique will be successful only if the cost of hiding a tonne of carbon underground falls lower than the cost of emitting a tonne into the air.

ECONOMIST: Carbon capture: Going underground | The

He decided to build an underground aquarium in Niagara Falls.

FORBES: Fish and Game