That means the U.S. hovers just above the replacement birth rate of an average two children per women, while the U.S. abortion policy (one of many factors influencing the Numbers) is purely voluntary.
这表示美国的人口出生率徘徊在每个妇女2个孩子以上，而美国堕胎政策是完全自愿选择的，这是诸多影响出生率的一个因素。
This large-scale rollout of birth-dose vaccination, in turn, prompted a policy change across the country.
这一做法反过来促进了全国各地的政策改变。
But Kroehnert says that in the case of declining birth rates, it will be difficult to make up for them simply by adjusting policy.
但是Kroehnert说，按现在这种递减的出生率走下去，仅仅靠改变政策很难解决问题。
On the control, the birth control policy make the proportion of aging people rise at an unstoppable rate.
控制出生政策使得老年化比例以不可阻挡的速度增长。
As the widely spread of one-child policy, some people have changed their conception about giving birth.
随着独生子女政策的广泛传播，一些人对分娩已经改变了他们的观念。
However, there are many reasons why formally ending the one-child policy will have limited impact on China \ \; s birth rate.
不过，有多种原因可以解释，为什么正式结束独生子女政策对提高中国出生率的影响有限。
At last, this paper confers the contents, the course and the deduction of policy analyses with the game theory from the viewpoint of the birth institution.
最后从生育制度的高度探讨了博弈政策分析的内容、过程与结论。
A new policy needs to be pro-active in increasing the birth rate, not just relaxing the limit to allow couples to have more than one child.
新政策需要能积极主动地提高出生率，而不是仅仅放松对夫妻一胎政策的限制。
As the widely spread of one-child policy, some people have changed their conception about giving birth.
由于广泛宣传独生子女政策，有些人已经改变了他们的生育观念。
The queue with this policy was analyzed by constructing a quasi birth-and-death process.
通过构造拟生灭过程 ，对网络流中的反馈优先策略的排队进行了分析 。
Since the 1970's, the achievements made in birth-control policy in China have been known to the whole world.
70年代以来，我国农村人口控制的成绩举世瞩目。
Since the 1970's, the achievements made in birth-control policy in China have been known to the whole world.
70年代以来，我国农村人口控制的成绩举世瞩目。
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