| 单词 | diaphragm |
| 释义 | diaphragm n 1 wall of muscle, between the chest and the abdomen, that helps to control breathing 膈; 膈膜; 横膈膜. =>illus at respire 见respire之插图. 2 arrangement of thin plates in a camera that control how much light is let in through the lens 光圈; 光孔; 光阑. 3 vibrating disc or cone producing sound-waves, eg in telephone receivers, loudspeakers, etc 振动膜（如电话听筒及扬声器等中的）. 4 (also Dutch cap, cap) thin plastic or rubber membrane that is fitted over the neck of the womb before intercourse to prevent conception 子宫帽（避孕用具）. |
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