By some studies, the safety nets for retirees have reduced fertility rates.
一些研究表明，退休人员的社会保障体系使生育率降低了。
Although some animal studies have indicated it is safe, others have linked injections of BPA to breast cancer, liver damage, obesity, diabetes and fertility problems.
虽然一些动物研究表明它是安全的，但是其它研究把双酚A药剂与乳腺癌、肝损伤、肥胖、糖尿病以及生育力等各种问题联系到一起了。
To date, studies do not show harmful effects from the pandemic influenza vaccine with respect to pregnancy, fertility, or a developing embryo or fetus, birthing or post-natal development.
目前为止，研究并非发现甲流疫苗对孕妇、多次妊娠过的孕妇产生有害作用，也没有发现对胚胎发育、孕妇生产、产后的有害作用。
But recent studies have found large changes in cues and behavior when a woman is at this stage of peak fertility.
不过近期的研究已发现，处于排卵高峰期的女性在行为暗示上有明显的变化。
"Elevated levels of PBDEs might be a risk factor for reduced fertility," said Schecter, who studies how people are exposed to the flame retardants.
“多溴二苯醚含量的提升对于生育能力的下降是一个危险因素，”长期研究人类在阻燃剂环境中的生存状况的阿德诺博士说道。
Now, at least, some of the factors affecting men's fertility have been mapped out and future studies will surely reveal others.
现在，至少一些影响男性生育能力的因素也已经被发现，并且将来还将发现更多。
It is also well known that women who never give birth are at greater risk of various cancers; studies had trouble untangling that effect from any connection to fertility drugs.
另外，已有确定证据表明，从未生育过的女性罹患各种癌症的风险本来就很高，因此研究者如何从其中分离出生育药物同癌症发生之间的关系，困难重重。
Previous studies have shown that weight can affect fertility in women, but the Danish study is the first to examine the impact of overweight or obesity in couples.
之前的研究已经表明体重影响女性的生育能力，丹麦的这项夫妇双方的体重超标或肥胖对生育能力影响的研究还属首次。
Despite some older reports suggesting a link with ovarian cancer, more recent studies fail to provide any convincing evidence that supports any association between fertility drugs and ovarian cancer.
尽管以前有些报告暗示与卵巢癌有关，最近的研究无法提供支持促排卵药和卵巢癌有联系的任何令人信服的证据。
Miller, an associate professor of psychology at the University of New Mexico, and his colleagues knew of prior studies that found women are more attractive to men when at peak fertility.
新墨西哥大学的心理学副教授和他的同事们了解到之前有研究发现排卵期的女性对男人的吸引力更大。
We already know that these fertility drugs can have a similar effect in laboratory studies.
我们已经知道，这些生育药物在实验室研究中有一些类似的作用。
These studies created with a view to study economics, first of its kind fertility.
这些研究开创了用经济学的观点来研究生育问题的先河。
Virtually all scientific studies support the conclusion that smoking has an adverse impact on fertility.
实际上所有的科学研究都支持吸烟对生殖力有不良影响。
Dr Lea said: "Though male fertility has been the subject of studies in recent years, this will be the first time that female fertility has been examined."
DrLea说：“虽然近年来一直研究雄性生育，但这将是第一次检查雌性的生育能力。”
There are four main parts. The first part reviews the existing studies on fertility rates both in China and abroad.
全文主要分位四个大部分：第一部分，对国内外关于生育率方面的研究文献进行了回顾；
This paper studies the new phenomenon of fertility change of Zhejiang.
本文主要研究浙江省人口生育率变动的新态势。
Effects of environmental factors on animal reproduction are also evaluated. These studies will be essential for improving animal fertility and developing contraceptives.
并研究各种环境因素对动物生殖过程的影响，这些研究将对提高动物的繁殖率、治疗人类不孕症等方面具有重要意义。
Other studies indicate that preconceptional vitamin supplementation can increase fertility.
其他研究表明，孕前维生素补充剂可以生育能力。
Other studies indicate that preconceptional vitamin supplementation can increase fertility.
其他研究表明，孕前维生素补充剂可以生育能力。
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