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	torn down torn into torn one's hair torn out torn size torn up tornada tornades tornadic tornado Tornado Alley tornado lamp tornado lantern tornadoes tornados tornal tornaria tornariae tornarian tornarias tornata Torne Torngat Mountains National Park torni tornillo

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