Definition
洞穴 (dòng xué) is the formal, written term for a natural cave or cavern. It is more specific than 洞 (dòng), which can mean any hole or cavity and is also used for the digit 0 in spoken numbers. Use 洞穴 for geological or literary contexts; use 洞 for everyday speech.
noun
cavecavern
Examples
- 洞穴。Tànxiǎnjiā men zǒu jìn le zhège shénmì de dòng xué.The explorers walked into this mysterious cave.
- 洞穴，。dòng xué lǐmiàn fēicháng cháoshī, érqiě hěn hēi.Inside the cave it's very damp and also very dark.
- 洞穴。Zhège dòng xué shì jǐ bǎi wàn nián qián xíngchéng de.This cave was formed millions of years ago.
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