性别比      sex ratio(285) gender ratio(33) sex ratios(39) sex proportion(10) sex rate(20) sexual rate(4) sexual proportion(5) 没有找到相关双语例句 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。   sex ratio First, in some clonal species, sexual reproduction and sex ratio vary largely among populations. 例句来源       The sex ratio of the pupae was nearly 1:1 in the woodland samples. 例句来源       Effects of Elevated Temperature on Sex Ratio in a Population of Hog Slaters (Asellus aquaticus L.) 例句来源       Seasonal changes in the abundance and sex ratio in the hog slater were monitored in nature throughout the annual cycle. 例句来源       It was shown that the sex ratio was balanced at a relatively low abundance in the autumn-winter period. 例句来源       更多             gender ratio For this purpose, 191 healthy Uygur individuals aged above 90 from Hetian area of Xinjiang were recruited, and another 53 persons aged 65-70 from the same nationality, the same region and with the same gender ratio, served as the control group. 例句来源       Influence of diagnostic classification on gender ratio in schizophrenia 例句来源       The child gender ratio and the social class of the parents did not differ significantly across groups. 例句来源       Only the gender difference regarding the gender ratio of dream characters has not been replicated; this finding might be explained by the relationship status (single vs. 例句来源       The competing gender ratio hypothesis assumes that relative fitness pay-offs, and thus the preferred mating roles, vary and may reverse between matings and predicts that ejaculation strategies co-vary with receiver quality. 例句来源       更多             sex ratios The sex ratios in the total populations and in individual age groups are unfavorable. 例句来源       Across all eggs, elevated levels of carbon dioxide significantly feminized sex ratios in both species and also reduced hatching success. 例句来源       Accumulation of biogenic carbon dioxide from embryonic respiration and other sources is thus likely to affect sex ratios in natural nests under some conditions, perhaps through an effect on some aspects of embryonic pH. 例句来源       For the same reason, sex ratios during the mating season may be more biased towards males than for whole year estimates (1.7:1 vs. 例句来源       Males that prior to mating were kept with other males only did not show ES variation with regard to different sex ratios at mating. 例句来源       更多             sex proportion In our case, spatial variation of age-sex proportion is the unknown variable to be estimated. 例句来源         其他          In 1980's the sex ratio of the total population in China and in most.of the provinces ,autonomous regions and municipalities increased obviously, meanwhile it differed greatly in each provincial destrict. these characteristics are closely related with natural growth and mechanical increase of population in China .and the main cause is the change of sex ratio at birth. The ratio at birth in China "and in most of the provinces, autonomous regions and municipalities, except Shanghai . Anhui.Guizhou .Qinghai,Xi...             本文根据有关资料,讨论了80年代我国人口性别比的变动特点及其省区差异,认为我国人口性别比上升的主要原因是出生性别比的变化,最后分析了人口性别比上升对我国男性婚姻的影响。 文摘来源          The rural economic reform has brought about a range of changes in demand for children of the Chinese peasants. This paper presents the findings from a survey in some rural areas of Zhejiang Province on the changes in fertility preference brought about by the improvement in rural women's status,and in recognition of the equal importance of the girls and boys in rural production and family support for the elderly. However, there is still a marked deviation from the moderm fertility pattern "fewer and later bi...             农村经济改革引起了中国农民生育需求发生了许多变化,以浙江省部分农村为例,随着妇女地位,尤其是年轻妇女的经济地位的提高,改变了人们对男孩的偏好,认识到在农村生产、生活和家庭养老中,女孩也同男孩一样发挥着重要作用。但是,在现实生活的需求发生变化的同时,人们精神生活的需求并没随着发生根本的变化,生男孩仍然是农民精神上的最大满足,这是近年来中国部分农村地区出生性别比偏高的根本原因。中国农民离“少生、晚生、生男生女都一样”的现代生育模式还有相当的距离,生育观念的现代化,既要求物质上的现代化,也要求精神上的现代化。 文摘来源          Using data from the 1990 fourth population census and the 1995 one' percent population sample survey, this paper examines the changes as well as the socio-economic differentials in sex ratio at birth in Beijing. Most probably the principal cause of the increased sex ratio at birth in Beijing in the context of very low fertility is the selectivity of childbearing.             本文用1995年北京市1％人口抽样调查数据和1990年第四次人口普查数据,对北京市统计的出生性别比的变化进行了比较分析。分析指出,90年代以来,北京市统计的出生性别比呈上升趋势。这主要是其中一孩性别比上升的缘故。在低生育率的环境下,选择性生育有可能是统计的出生性别比上升的主要原因。转变人们的传统观念,创造男女平等的社会条件,是使出生性别比恢复正常的关键所在。 文摘来源   << 更多相关文摘         相关查询: 性别比问题 性别比失调 生育性别比 儿童性别比 死亡性别比 人口性别比 第二性别比 婚配性别比 流产性别比 性别构成比 性别比偏 男女性别比  对查询结果不满意

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