单词	iris diaphragm
释义	iris diaphragm noun : an adjustable diaphragm of thin opaque plates that can be turned by a ring so as to change the diameter of a central opening usually to regulate the aperture of a lens (as in a camera or microscope)
随便看	dent dental dental dental arch dental artery dentale dental engine dental floss dental formula dental hygienist dentaliidae dental index dentality dentalium dentalization dentalize dental lamina dental length dentally dental nerve dental pad dental papilla dental plate dental preterit dental pulp

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