印刷行业数量众多，分布广泛，其环境有害因素不容忽视。
The printing industry is numerous, distributed widely, and its harmful environmental factors can not be ignored.
目的：了解本区生产环境有害因素测定情况，为今后职业健康防护工作提供参考。
Objective:To understand the risk factors of production environment in this district, to provide the reference for the prevention of professional health in the future.
已假定的环境有害因素，如：父母亲吸烟、同胞数量和空气污染都应对该病的患病率增加负责。
It has been hypothesised that environmental risk factors, such as parental smoking, number of siblings, and air pollution, are responsible for this increase.
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