diaphragm
名词 diaphragm:
a mechanical device in a camera that controls size of aperture of the lens
同义词:stop
(anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration
同义词:midriff
a contraceptive device consisting of a flexible dome-shaped cup made of rubber or plastic; it is filled with spermicide and fitted over the uterine cervix
同义词:pessary, contraceptive diaphragm
electro-acoustic transducer that vibrates to receive or produce sound waves