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	special appearance special area special assessment special assumpsit special bail special bastard special carrier special case special collection special contract special court special court-martial special creation special damage special delivery special-delivery stamp special demurrer special deposit special deputy special dividend special drawing rights special duty special education special effect special endorsement

英语词典包含332784条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。