subterranean

Compared meaning: located below the surface of the ground (adjective).

比较义项：地下的（形容词）。

• underground

  The common, everyday word for anything below ground; used in ordinary contexts like parking, tunnels or pipes, and can also work as a noun or adverb, or mean 'secret/hidden' (senses not compared here).

  这是表示“在地下”的最常用、日常用词；用于停车场、隧道、管道等普通语境，也可作名词或副词，或表示“秘密的、地下组织的”（这些义项本卡片不作比较）。

  The mall has an underground parking garage for shoppers.

  这家商场有一个供顾客使用的地下停车场。

• subterranean 本词

  A more formal, literary or technical word for underground, typically used in geological, scientific or descriptive writing rather than everyday speech.

  语体更正式、书面化，多用于地质、科学或文学性描写，较少用于日常口语。

  Geologists discovered a vast subterranean lake beneath the desert.

  地质学家在沙漠地下发现了一个巨大的地下湖。

Underground and subterranean both mean below the ground and are often interchangeable, but underground is the common, everyday word, used for things like parking or tunnels. Subterranean is more formal and literary, common in geological, scientific, or descriptive writing, not everyday speech.

这两个词在这个意义上都表示“地下的”，很多时候可以互换，但语体不同：underground是最常用、口语化的词，日常事物（停车场、隧道、地铁）都用它；subterranean更正式、书面化，常见于地质、科学或文学性描写。underground还有其他常见义项（如“秘密的、地下组织的”，以及作名词或副词的用法），这里不作比较。