单词birth rate
n.: 出生率
网络: 人口出生率；生育率；再生速度
出生率（某地区每年每 1 000 人中的出生数目）:
the number of births every year for every 1 000 people in the population of a place
出生率
复数：birth rates
Since the number of children is now low, the birth rate will not be able to increase for the next two decades, he said.
他说道，目前儿童的数量太少，在未来20年内人口出生率不可能增加。
While it shows the U. S. population is more than replacing itself, a healthy trend, the teen birth rate was up for a second year in a row.
虽然它显示了美国的人口超过取代本身，一个健康的趋势，青少年出生率上升的连续第二年。
However, there has hardly been a year since 1957 in which birth rate have not fallen in the Untied States and other rich countries.
然而，自1957年以来，美国和其他发达国家的人口出生率几乎每年都在下降。
America"s economy grew more quickly partly because its population rose by almost 1% a year, thanks to immigration and a higher birth rate.
美国经济增长速度更快，部分原因是因为移民以及较高出生率导致其人口年增长率几乎为1%。
Immigrants are not pushing up the birth rate as much as they seem to be.
移民并未如表面看来那般抬高了出生率。
China would maintain a low birth rate, he said. But it would also "stick to and improve" its current family-planning policy.
他说，中国将切实稳定低生育水平，同时称要“坚持和完善”现行生育政策。
Rapid population growth is due not so much less than the birth rate rose as a result of the decline in mortality.
人口的迅速增长与其说是由于出生率年升还不如说是由于死亡率的下降。
Nine months at least must pass between an event and a corresponding change in the birth rate.
从受孕到出生率的相应改变至少需要九个月的时间
Secondly, there has been a rapid expansion of our national economy. Furthermore, the birth rate has been put under control.
其次，国民经济正在快速发展，然而而且出生率已经得到控制。
The number of marriages between cousins is dropping just as spectacularly as the birth rate, thereby blasting away a barrier.
近亲婚姻的数量正象出生率一样急剧下降，由此排除了一大障碍。