No. 1,725 in Chinese
地下
"Underground" or "subterranean."
In a sentence
他把秘密文件藏在地下室里。
He hid the confidential documents in the basement.
In this sentence, '地下' is combined with '室' to form '地下室', which means 'basement'. It refers to a location below the ground level.
城市的地下铁路系统非常发达。
The city's underground railway system is very developed.
Here, '地下' acts as a descriptor for '铁路系统' (railway system), meaning 'underground'. It emphasizes the location of the railway system beneath the ground surface.
在战争中，许多地下组织起到了重要作用。
During the war, many underground organizations played crucial roles.
In this instance, '地下' metaphorically refers to 'covert' or 'hidden', describing organizations operating in secrecy, not physically underground.
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