cavity
英 ['kævɪtɪ]
美['kævəti]
	    - 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