单词	back projection
释义	back projection noun : background projection Word History First Known Use circa 1933, in the meaning defined above
随便看	propellors propelment propels propenales propenals propend propended propendent propending propends propenes propenoates propenoic acid propenols propenonitriles propense propension propensities propensity proper proper adjective proper fraction proper motion proper noun proper nouns

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