The move to replacement-level fertility is one of the most dramatic social changes in history.
人口趋向生育等值替换水平是历史最有戏剧性的社会变化。
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。
Eurostat researchers caution that their projections are a "what if" scenario and do not take into account future changes in immigration policy or fertility rates that could alter the outcome.
欧共统计局警告说，他们的调查结果只是一种想设，没有考虑未来移民政策和出生率改变会带来的结果。
A committee of MPs and peers, set up in May to examine planned changes to the law governing fertility treatment, thinks so.
五月份新成立了一个由上下两院议员组成的委员会，该委员会专门检查不孕不育治疗方面法律的计划性修改，它认为父母应该让孩子知道自己是如何出生的。
We know that personality changes more during your 20s than at any other time in life, and we know that female fertility peaks at age 28, and things get tricky after age 35.
我们知道在20多岁的时候，性格的改变多于生命中任何时期。我们也知道女性的最佳生育时期在28岁的时候达到顶峰，35岁之后生育变得困难。
The relationship between quantity changes of fungi in different fertility black soils and 6 environmental factors was studied through one stage of corn growth.
研究了东北地区不同肥力下黑土土壤在玉米一个生育期内真菌数量的动态变化以及与6种环境因子的关系。
The factors affecting soil fertility are: river harnessing, fertilizer application, and the changes in cropping system and land utilization after the adoption of high yield hybrid verities.
影响肥力变化的因子包括河流治理、施肥、高产品种使用后种植制度和土地利用程度的变化等等。
The performances of the change in reproductive behaviour are the number of births, fertility preferences and other aspects , which will surely lead to changes in the structure of the family.
生育行为的变化则外化为生育数量、生育偏好等方面的转变，转变的结果是家庭结构的变化。
This provides an empirical basis for examining the Changes in China's fertility intentions and fertility levels.
这为认识生育意愿和生育水平在中国的变化趋 势提供了实证依据。
The paper discusses the changes of social mobility mechanism 'effects on fertility rate in rural from macrocosm.
本文从宏观层面探讨了社会流动机制的变迁对农村生育率的影响。
The paper discusses the changes of social mobility mechanism 'effects on fertility rate in rural from macrocosm.
本文从宏观层面探讨了社会流动机制的变迁对农村生育率的影响。
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