查询词典 sex ratio

And it massively distorts the country's sex ratio, with devastating results.

这个严重地扭曲了这个国家的性别比例，并将带来灾难性的后果。

According to the data of Natality Statistics of Demographic Yearbook (2002) U. N., the author described and analyzed statistic characteristics and dynamic tendency of sex ratio at birth for different types of countries in the world recent two decades, which is to reflect the general pattern of SRB and provide the background and base for further recognizing ubnormal phenomenon of SRB in Chi

利用联合国《人口年鉴》出生统计专辑汇集的世界各国多年的人口出生数据，对全球不同类型国家近20年来人口出生性别比的统计特征和动态趋势进行描述和概括，以尝试着反映人类人口出生性别比的一般规律及特点，为更客观、准确地认识中国人口出生性别比失常提供背景与基础。

Specimens were examined by histological method to determine the cycle of the gonad development of this nemertean. The results showed that: The sex ratio (female: male) was about 1: 1. The sizes of mature males and females were not significantly different; females are rosy in colour and males are white, largely owing to the metamerically arranged gonads. Gonads, which were not detected in samples of autumn months, arose in December, but sexes were indistinguishable until middle January.

结果表明：扁额原细首纽虫雌雄比例约为1：1；雌雄体长、体重无显著差异；性成熟雌体通常体壁呈玫瑰红色，雄体呈白色，非繁殖季节雌雄体色无明显差异；一年有两次性腺发育，第一次12月开始出现性腺，1月可辨雌雄，3月15日达到第一次性腺发育高峰，4月15日性腺消失；第二次于4～5月开始出现性腺，6月15～30日达到高峰，9～10月性腺消失。

Keeping the sex ratio of birth population in the normal range is one significant basis for harmonious society.

人口和谐是社会和谐的基础，人口性别的和谐是人口和谐的重要组成部分。

Its overall sex ratio is 120, which is very high.

其总体性别比例是120，这是非常高的。

For the first time, this study conducted a series of field sampling in multiple locations over several years and demonstrated that the B and Q biotypes first invade areas with high frequency of transport through human movement of plant materials, and then rapidly spread into surrounding areas and displace indigenous genotypes, and in parallel with displacement significant changes in sex ratio occurred in the mixed populations. Crossing experiments demonstrated that in the B. tabaci species complex there are many genetic groups that are completely or nearly completely isolated in reproduction. Apart from behavioural mechanisms, difference in host plant suitability and insecticide susceptibility between whitefly biotypes may also play important roles in the displacement of indigenous whiteflies by alien whiteflies in Zhejiang.

本研究首次以一个地理区域内广泛系统的野外调查数据证实，B型和Q型烟粉虱首先通过花卉苗木调运入侵交通较为发达的地区，然后迅速向周边扩张并取代土著烟粉虱，同时入侵取代过程伴随着混合种群中性比的变化；杂交试验证明烟粉虱复合种内存在多个生殖上隔离或基本隔离的遗传群；B型烟粉虱在浙江省内迅速取代土著烟粉虱，除行为机制外，生物型之间寄主适应性和药剂敏感性等方面的差异也可能在此过程中起着重要作用。

Host plants affected the survival, development time and reproduction of P.xylostella and indirectly affected the survival, development time, fecundity and sex ratio of the parasitoid.

6小菜蛾及菜蛾绒茧蜂的生存、发育、繁殖等均不同程度地受寄主植物的影响，小菜蛾成虫期的产卵嗜好性并不反映植物对其幼虫期的相对适合度。

The sex ratio of plateau pika before and after overwintering did not vary.

捕食风险也是影响性比的主要因素。

The sex ratio of the pupae was nearly 1:1 in the woodland samples.

在调查样地中，雌雄蛹的比例基本为1：1。

There was no significant difference in larval survival, sex ratio, pupation and adult emergence among four genotypes.

结果表明，抗性基因型在产卵量、卵孵化率、幼虫及蛹历期和成虫存活期等方面与敏感基因型相比较存在明显的不利性；与敏感基因型相比，抗性基因型只有045的适合度，RS和SR基因型的相对适合度分别为114和108。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。