单词	roof prism
释义	roof prism noun : a glass prism used in an optical range finder and other instruments that performs the double function of changing the direction of the light rays by 90 degrees and reversing the image right to left compare porro prism Word History First Known Use 1904, in the meaning defined above
随便看	Belo Belo Horizonte beloid Beloit belomancies belomancy Belomys belon Belone belonephobe belonephobes belonephobia belonephobic belong belong to belonged belonged to belonging belonging to belongingness belongingnesses belongings belongs belongs to belonid

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