「births」を解説文に含む見出し語の検索結果(1～10/271件中)
ratio between births and deaths...
proportion of births to the population...
proportion of births to the population...
ratio between births and deaths...
excess of births over deaths...
ratio of births to marriages...
interval between successive births...
surplus of births over deaths...
previous births to the mother...
births of the present marriage...
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