sex ratio

基本解釋

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,男性相對于女性的人數(shù),還與飲食有關,與遷移有關
耶魯公開課 - 美國內戰(zhàn)與重建課程節(jié)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，出生性別比有逐年升高趨勢，某些地區(qū)已呈現(xiàn)明顯失衡狀態(tài)。
農業(yè)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.
解釋了過冷卻處理誘發(fā)的四倍體后代三倍體蠶發(fā)生性比從3：1向5：1變化的現(xiàn)象。
生物學
性比
性比率