比如,歐洲某國平均預期壽命是80,那麽64歲以上為老人。非洲某國預期壽命是60,48歲以上就算老人。
比如,歐洲某國平均預期壽命是80,那麽64歲以上為老人。非洲某國預期壽命是60,48歲以上就算老人。
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