Scientists are also working to develop chemicals to control the birth rate in deer populations.
科学家们也在努力研制化学物质来控制鹿群的出生率。
The newly domesticated animals behaved better, were easier to control, and may have enjoyed a higher birth rate, which in turn yielded greater milk supplies.
新驯养的动物表现更好，它们更容易控制，出生率也更高，且反过来也会提供更多奶源。
The Centers for Disease Control and Prevention released data recently showing that in 2009 the preterm birth rate declined, for the third year in a row, to 12.18 percent of all births.
疾病控制和预防中心最近发布的资料表明近三年来早产的比例连续在下降并在2009年下降到占总出生率的12.18%。
The birth rate is under control in this country.
这个国家的出生率已得到控制。
The birth rate for American women aged 40-44 years has more than doubled in the last 25 years, according to the Centers for Disease Control, a greater increase than in any other age group.
根据疾病控制中心的数据，在过去的25年里，年龄在40 - 44周岁的美国妇女的出生率已经增长了2倍以上，这要比其它任何一个年龄组增长都要多。
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。
We must carry on an active publicity drive to get birth rate under control.
我们必须进行积极的宣传工作以控制生育。
Researchers in the United Kingdom followed more than 46,000 women who took the pill and then compared the mortality rate of those women with women who did not take birth control pills.
英国的研究者对46,000名口服避孕药的妇女进行了随访，然后将其死亡率与未服避孕药的妇女进行对比。
Alternatively we could start acting right now to bring birth rate under control within fifteen years so that population levels off.
我们可以选择开始行动在未来的15年控制出生率以使人口水平达到平衡。
The teen birth rate in the United States reached an all-time low last year, the Centers for Disease Control and Prevention reported on Thursday.
美国疾病控制和预防中心在周四报道，去年以来美国的出生率达到了又是以来的最低点。
If we don't control the birth rate right now we'll surely lead a miserable life in the near future.
如果我们现在不控制出生率，我们在不久的将来必定要过上更悲惨的生活。
Poor education and taboos against birth control continue to fuel the spiralling growth rate, now at 5 percent annually.
学导程度低跟对击算死育的忌讳使得那面的死齿删加快度保持正在每年5%。
Furthermore, the birth rate has been put under control.
此外，人口出生率得到了有效地控制。
If we do not control the birth rate, we'll be on the edge of starvation in the near future.
如果我们不控制出生率，在不远的将来将会濒于饥饿的边缘。
Then, legalized abortion and birth control began to reduce the birth rate.
之后，堕胎合法化及节育措施开始影响日本的人口出生率。
Then, legalized abortion and birth control began to reduce the birth rate.
之后，堕胎合法化及节育措施开始影响日本的人口出生率。
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