洞穴 (dòngxué): cave

Measure Word

一个洞穴 gè

探险队发现了一个巨大的洞穴。

Tànxiǎnduì fāxiàn le yīgè jùdà de dòngxué.

The expedition team discovered a huge cave.

蝙蝠住在洞穴里。

Biānfú zhù zài dòngxué lǐ.

Bats live in caves.

memory

Both 洞 and 穴 mean 'hole/cave', so 洞穴 is a reinforcing compound — two cave-words together for emphasis.

洞 dòng

穴 xué