凹洞

āo dòng

Meaning

cavity; pit

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Characters

凹āoconcave, hollow; depressed; pass, valley一洞dòngcave, grotto, hole, ravine氵同

Sources: CC-CEDICT (CC BY-SA 4.0) · audio-cmn — Yue Tan, Chen Wang (CC BY-SA) · Make Me a Hanzi (LGPL / Arphic PL) · Tatoeba (CC BY 2.0 FR)