Both triclosan and BPA have long been suspected of causing health problems, the 100 million dollar question is whether we should worry about the low-level exposure most of us get.

长期以来，人们一直怀疑三氯沙和双酚A是否对身体健康有影响，而现在关键的问题是低浓度下的这些物质是否会对人类产生影响。

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At present, there is insufficient data to draw firm conclusions about health effects from long-term low-level exposure typically occurring in the everyday environment.

目前，关于通常发生在日常环境中的长期低剂量辐射对人体健康的影响，仍缺乏足够的数据来做出强有力的结论。

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Searching for the effect biomarkers of long-term and low-level exposure to op has a very important meaning in detection of the earlier harmful effect of exposed populations in time.

探讨长期低剂量接触OP的效应标志物，对于及时发现职业接触人群早期健康损害，预防和控制慢性农药中毒具有十分重要的意义。

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The report does not rule out other possible contributors to Gulf War illness -- including low-level exposure to nerve agents and close proximity to oil well fires -- though it fails to establish any clear link.

CNN: Gulf War illness is real, new federal report says

Previous research has indicated that low-level lead exposure may increase the risk of a number of chronic age-related diseases.

BBC: NEWS | Health | Lead exposure link to cataracts