Chemical factor has been incriminated as one of the fundamental causes of environmental pollution, chemical factor occupies a pivotal position in solving environmental problems.

造成环境污染的重要原因之一是化学因素，解决环境污染问题，化学起举足轻重的作用。

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In this sub-system, a toolbox of multivariate calibration, a toolbox of chemical factor analysis, a toolbox of cluster analysis, a toolbox of overlapping peak resolving were involved.

本研究开发了多元校正工具箱，化学因子分析工具箱，聚类分析工具箱，以及谱图分峰拟合工具箱。

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Increased levels of brown fat may also be attributed to an increase in a brain chemical called brain-derived neurotrophic factor [BDNF] found in the sociable mice.

在社会性的小鼠大脑中发现，褐色脂肪的增加可能还归因于大脑中的一种化学物质，称为脑源性神经营养因子。

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If you could introduce that gene you'd make the chemical, in this case it's a protein called vascular endothelial growth factor.

通过导入一种生成特殊化学物质的基因,这种疗法中指的是一种蛋白,叫做血管内皮生长因子

耶鲁公开课 - 生物医学工程探索课程节选

Although it is understandably tight-lipped about the exact mechanism behind its success, one probably enlists the help of cells called keratinocytes, which interact naturally with the dermal papilla cells of the hair follicle and secrete a chemical factor that supports their growth.

ECONOMIST: A cure for baldness

Research indicates that a diet high in added sugar reduces the production of a brain chemical known as brain-derived neurotrophic factor (BDNF).

FORBES: What Eating Too Much Sugar Does to Your Brain