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1·They call for incentives to keep women at home to breed (though poor career prospects for mothers are a big factor behind a precipitous fall in the fertility rate).

他们呼吁拿出措施来鼓励家庭里的妇女生育(然而母亲们糟糕的职业前景正是生育率突然大幅下降的一个背后原因)。

2·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。

3·Right before the debate on abortion came one on whether a child's need for a father should continue to be a factor that fertility doctors must consider when deciding whom to treat.

早在堕胎问题引起争论之前，关于试管婴儿是否需要父亲的权利就争论不断，当实施人工受精的医生决定非婚生子女的抚养权时，这个问题就再次浮上台面。

4·The status of soil aggregates is an important factor affecting soil fertility.

土壤团聚体和水稳性团聚体的状况是影响土壤肥力的一个重要因素。

5·Abiotrophy resulted from soil fertility inadequacy was a main limiting factor for the growth and development of apple trees in this region.

不施肥或施肥不足，则成为影响红富士幼树生长、发育和早实性的主要限制因子。