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单词	Fresnel lens
释义	Fresnel lens noun Fres·​nel lens ˈfrez-nəl-  frā-ˈnel-  : a lens that has a surface consisting of a concentric series of simple lens sections so that a thin lens with a short focal length and large diameter is possible and that is used especially for spotlights Word History Etymology Augustin J. Fresnel First Known Use 1865, in the meaning defined above
随便看	silaging silane silanes silas Silastic silastics silcrete sild sildenafil silds sile siled silen silence silence cloth silence is golden silenced silencer silencers silences silencing silene silenes outraised outraises

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