cavity
noun [ C ] uk/ˈkæv.ə.ti/ us/ˈkæv.ə.t̬i/
(HOLE)
空隙;洞;腔
a hole, or an empty space between two surfaces
The gold was hidden in a secret cavity. 金子藏在一个隐秘的洞穴里。
(TOOTH)
（牙齿上的）龋洞，蛀牙洞
a hole in a tooth
(IN THE BODY)
medical specialized（身体内的）腔
a hollow space in an organ or body part
the upper nasal cavity 鼻腔上部
Synonyms: chamber (SPACE) gap (HOLE)hole (SPACE)hollow pocket (GROUP/AREA)space (EMPTY PLACE)