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Underground
01
a city's railway system that is below the ground, usually in big cities
02
a secret group organized to overthrow a government or occupation force
underground
01
situated, operating, or existing beneath the surface of the ground
02
conducted with or marked by hidden aims or methods
例
Commuters rely on the underground to navigate the bustling city quickly and efficiently.
She purchased a monthly pass for the underground to save money on her daily commute.
They discovered a profound underground aquifer that could provide water for the entire region.
