The factors for American suburbanization are many, including technological factor, economic factor, environmental factor, and social factor.

推动美国城市郊区化的动力机制是多方面的，包括技术的、经济的、环境的和社会文化的因素等。

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Main factors affecting the scientific literacy of teenagers could be categorized into group factor, individual factor, environmental factor, and the manner of education and learning.

影响青少年科学素养的主要因素可归纳为群体因素、个体因素、环境因素、教育与学习科学途径等四个方面。

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The influence factor of concrete carbonation can be divided into material factor, environmental factor and construction factor.

影响混凝土碳化的因素较多，主要是：材料因素、环境因素和施工因素。

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But the report singles out food production as the other major factor driving environmental degradation.

VOA: standard.2010.06.04

"If we refuse to take into account the full costs of our fossil fuel addiction - if we don't factor in the environmental costs and the national security costs and the true economic costs - we will have missed our best chance to seize a clean energy future."

VOA: standard.2010.06.14

Plastic electronics technology has many economic, manufacturing, form factor and environmental benefits, assuring that it will replace silicon in a variety of devices in the future.

ENGADGET: Plastic Logic kills QUE, 'shifts focus' to second-generation ProReader

It may be that genetic mutations can accumulate without actually leading to a disorder, until, perhaps, they are triggered by an environmental factor or pile up enough to reach a critical mass.

FORBES: Across Generations: Older Fathers May Transmit Autism Risk To Their Grandkids

Singer notes a number of possible explanations for why the other two groups might not have seen the behaviors initially reported, including compensation thanks to other genes, some unknown environmental factor, or variability in the knocked-out gene.

FORBES: Mouse Behavior From Autism Studies Not Reproducible