Doctors believe that heredity and chronic exposure to loud noises are the main factors that contribute to hearing loss.

医生们认为遗传因素和长期处于高分贝的嘈杂环境是导致失聪的主要因素。

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That is the difference between acute and chronic exposure, and it is a difference most people understand.

这就是急性暴露和慢性暴露的区别，大多数人都能理解这两者的不同之处。

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Experiments have shown there to be no harmful effects from chronic exposure to acetylene at high concentrations.

实验显示慢性接触高浓度乙炔没有有害影响。

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It talks about research needed on people with chronic exposure to OPs claiming ill health problems.

BBC: News | HEALTH | Sheep dip: The reaction

It is important to mention that this condition is not a burn, but just a skin condition that develops as a result of chronic exposure to moderate heat.

FORBES: Some Like It Hot

If you have a history of asthma or emphysema, (COPD) or other chronic lung disease, limit your exposure to the cold temperatures.

FORBES: Important Cold Weather Safety and Tips