它分为以 下三种： （1）物质风险因素（physical hazard）。又 称实质风险因素或物理风险因素，是指人或物的自 然状况、性质以及环境等物质方面的风险因素。
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罹患哮喘的最大风险因素是吸入可能导致过敏反应或刺激呼吸道的物质和颗粒。
The strongest risk factors for developing asthma are inhaled substances and particles that may provoke allergic reactions or irritate the airways.
Garcia解释道，多巴胺突然产生有三个最主要的情感因素，即高风险，物质回报，情绪多变—或者通过很多其它途径让你的经历有所收益。
Garcia explains that the three big emotional elements of a dopamine rush are high risk, substantial rewards and variable motivation - or numerous ways the experience can pay off.
有些因素可能会增加你患白血病的风险，比如暴露于大量的辐射和在工作中接触某些化学物质，如苯。
Some things may increase your risk, such as being exposed to large amounts of radiation and being exposed to certain chemicals at work, such as benzene.
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