“diaphragm”的概念、定义、翻译、参考文献-科学参考

单词	diaphragm
释义	diaphragm [`dī·ǝ´fram] ^ANATOMY The dome-shaped partition composed of muscle and connective tissue that separates the abdominal and thoracic cavities in mammals. ^{ELECTROMAGNETISM} See <<iris>> ^ENGINEERING A thin sheet placed between parallel parts of a member of structural steel to increase its rigidity. ^{ENGINEERING ACOUSTICS} A thin, flexible sheet that can be moved by sound waves, as in a microphone, or can produce sound waves when moved, as in a loudspeaker. ^OPTICS Any opening in an optical system which controls the cross section of a beam of light passing through it, to control light intensity, reduce aberration, or increase depth of focus. Also known as lens stop. ^PHYSICS 1. A separating wall or membrane, especially one which transmits some substances and forces but not others. 2. In general, any opening, sometimes adjustable in size, which is used to control the flow of a substance or radiation.
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