单词	back focus
释义	back focus noun : the distance from the rear glass surface of a photographic lens to the focal plane when the lens is focused on a very distant object Word History First Known Use 1868, in the meaning defined above
随便看	schwein Schweinfurt Schweinfurt green schweinfurth green Schweitzer schweitzer's reagent schweiz Schweizer's reagent Schweizerdeutsch Schweizerfranken schweizes schweizzes Schwenkfelder Schwenkfeldian pining after pining away pining for pinion pinion end pinioned pinioning pinions pinite pinites pinitol

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