birth rates

Poverty and illiteracy go together with high birth rates .

贫困、文盲与高出生率密切相关。

Maternity services were to be reduced in consequence of falling birth rates .

由于出生率下降，产科服务会随之削减。

In the north of India , the population is booming due to high birth rates , but in the south , where most economic development is taking place , birth rate is falling rapidly ．

在印度北部,出生率高,人口正飞速增长,而在经济发达的南部,出生率正在迅速下降。

High birth rates were often balanced out by high death rates .

高生育率常被高死亡率抵消。

Regional Distribution of Birth Rates of Twins in China

中国不同卵性类型双生子出生率的地区分布

Russia also has low birth rates .

俄罗斯同样只有较低的出生率。

Analysis of international variations in birth rates

国际间出生率差异分析

The influence of maternal ages on the birth rates of twins in China

母亲年龄对中国双生子出生率的影响

This is not only due to high birth rates , but to lower death rates as well .

这不仅仅是由于出生率高，而且还由于死亡率低的缘故。

All of these groups continue to have above-average birth rates .

所有这些族群出生率将继续维持在平均数以上。

European birthrates are not that much higher than Asian birth rates either .

欧洲的出生率也并不比亚洲的高多少。

The 10 nations with the highest birth rates in the world are all in Africa .

全世界出生率最高的10个国家都在非洲。

The analysis showed a decline in birth rates for all examined populations in spring of 1919 .

分析显示，1919年春季，所有接受调查的人口出生率都有所下降。

Birth rates must equal death rates , and production rates of commodities must equal depreciation rates .

例如，出生率会等于死亡率，而商品生产率也会等于折旧率。

Nations were uneasy about their falling birth rates .

一些国家为本国日益下降的人口出生率感到不安。

The increased value placed on the idea of the family also helps to explain this rise in birth rates .

不断受到重视的家庭观念也有助于解释出生率的上升。

As birth rates remain low , many workplaces including hospitals are chronically short-staffed .

因为日本出生率一直都很低，包括医院在内的许多工作场所都是长期缺人。

Along with education , income and health care , the decline in birth rates correlates closely with urbanization .

教育、收入与卫生保健的改善，以及出生率的下降，都与城市化息息相关。

Birth rates can rise ( as they just have in Japan for the first time in years ) as well as fall .

出生率既可能上升（正如日本多年来首次出现的情况），也可能下降。

Preterm birth rates in the United States have increased thirty-six percent in the last twenty-five years .

在过去的25年，美国的早产率增加了36%。

Region-specific multiple regression models were used to estimate the preterm birth rates for countries with no data .

使用特定地区的多元回归模型来估计无相关数据国家的早产率。

Recession has affected the marriage and birth rates of native-born citizens , too .

经济衰退也同样影响到了本土公民的结婚率及出生率。

Birth rates rose to 102 per thousand in 1946 , 106.2 in 1950 , and 118 in 1955 .

1946年出生率上升到102%，1950年达106%，1955年达118%。

Germany is facing a crisis as low birth rates combine with a growing population of citizens who are living longer .

德国目前正面临着低人口出生率和人口老龄化的危机。

Even with declining pregnancy rates , the United States still has one of the highest overall birth rates among industrialized countries .

尽管国内怀孕率持续走低，美国依旧是发达国家中出生率最高的国家之一。

S.New research published in Nature this week shows that birth rates in the most developed countries are rising again .

本周发表在《自然》（Nature）杂志上的一项新研究表明，在大多数的发达国家中，出生率正在上升。

Milan is a fast-ageing city in the country with one of the lowest birth rates in Europe .

米兰是意大利老龄化最快的城市，也是欧洲出生率最低的城市之一。

Rich countries are at the beginning of a demographic crisis , with birth rates starting to fall below replacement levels .

各个富国正处于人口危机的开端，出生率开始降至更替水平以下。

Experts say this was a result of falling birth rates among some groups and fewer immigrants because of the recession .

专家表示这是由于经济衰退，某些人群出生率降低，移民数量减少。

Condom sales , birth rates , transmitted disease and toys : The determinants of a sexy US city .

避孕套销量，生育率，性传播疾病和情趣玩具：则是美国“性感”城市的决定因素。