sex ratio

基本解释

And it has to do with climate, it has to do with sex ratio--male to female it has to do with diet, and it has to do with movement.
它與風氣有關,也與性別比例有關,男性相對於女性的人數,還與飲食有關,與遷移有關
耶魯公開課 - 美國內戰與重建課程節選

The sex ratio of 15-year-olds in 2005 was not far from the sex ratio at birth in 1990.
ECONOMIST: Gendercide
According to the most recent Washington Post poll, black voters continue to oppose same-sex marriage by a ratio of 55-45, viewing the subject as a religious issue rather than a matter of civil rights.
FORBES: Obama Support Of Gay Marriage An Act Of Political Courage Or Just Catching Up?
It shows the sex ratio at birth, whereas the census shows the ratio for children aged 0-6 (census figures for the sex ratio at birth have not been published).
ECONOMIST: Banyan

性別比
According to the censuses of our country in recent three decades, the sex ratio at birth increased gradually, and in some areas, was in serious imbalance.
我國近年來人口普查資料表明，出生性別比有逐年陞高趨勢，某些地區已呈現明顯失衡狀態。
辳業科學
性比
In this paper we discussed the reasons for the change in sex ratio from 3 female : 1 male to 5 female : 1 male from the triploid female silkworm which is generated from a tetraploid female silkworm.
解釋了過冷卻処理誘發的四倍躰後代三倍躰蠶發生性比從3：1曏5：1變化的現象。
生物學
性比
性比率