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	nitrate nitrate nitrate bacterium nitrate group nitrate ion nitrate of iron nitrate of lime nitrate of potash nitrate of soda nitratine nitration nitrato nitrato- nitrator nitre nitre nitriary nitric nitric nitric acid nitric anhydride nitric oxide nitridation nitride nitride

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