"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。

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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。

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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。

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Perceived fertility problems may also factor in, it said.

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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.

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Another factor may be the impact of density, which, Cox demonstrates, tends to depress fertility rates not only here in the United States, but through much of the world.

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