这些迹象可能由多种因素造成，包括吸烟、吃油腻的加工食品、新鲜空气不足等等。
They could be triggered by a host of factors including smoking, eating fatty, processed foods and not getting enough fresh air.
这种奇异食物的跟随者认为它们不需要食物-只需通过阳光和新鲜空气生存(不足为奇的，许多人最终不免一死)。
Followers of this bizarre diet believe they don't need food - and can survive on sunlight and fresh air alone (unsurprisingly, many devotees died).
天然光线不足、新鲜空气缺乏、湿度大等物理特性不利于人们的生理健康。
Such physical characteristics as insufficient natural light, lacking of fresh air, much humidity are unfavorable to people's physiological health;
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