cavity
- n. 腔；洞，凹处
英英释意
- 1. a sizeable hole (usually in the ground);
- "they dug a pit to bury the body"
- 2. space that is surrounded by something
- 3. soft decayed area in a tooth; progressive decay can lead to the death of a tooth
- 4. (anatomy) a natural hollow or sinus within the body