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。
The issue of fertility safety has theory and policy value.
生育安全命题具有理论和政策价值。
Fertility safety consists of fertility ability safety, fertility process safety, fertility health safety and fertility security safety.
生育安全问题包括生育的能力安全、育的过程安全、育的健康安全和生育的保障安全。
Using continuous reproductive tests, fertility of mice and the development of their offspringswere observed to evaluate the safety of the high background radiation containing drinking water.
根据美国毒理研究机构提出的持续繁殖实验的方法，观察高本底放射性饮水对小鼠生育力及仔鼠生长发育的影响。
Index system to evaluate fertility safety includes positive indexes and negative indexes.
测度生育安全的指标体系包括正向指标和负向指标。
Index system to evaluate fertility safety includes positive indexes and negative indexes.
测度生育安全的指标体系包括正向指标和负向指标。
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