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	pioner pionnotal pionnotes piony piophilid piophilidae piosity piotine pioupiou pioury pious piously piousness pip pip pipa pi-pa pipable pipage pipal pipal pipal tree pip card dauntlessness daunton

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