洞窟

1. Origins, structure, and basic meaning

• Structure: 洞窟 is read as どうくつ and means cave or cavern.
• Basic usage: It can identify a dark cave entered by explorers or a seaside cavern where waves echo.

2. Common pitfalls and similar expressions

• Entering a dark cave
  • 洞窟: The exploration team entered the dark cave carrying torches. Example: 探検隊は松明を持って暗い洞窟へ入った。
• Waves echoing in a seaside cavern
  • 洞窟: The sound of waves echoed in the seaside cavern. Example: 海辺の洞窟には波の音が響いていた。