Experts cannot tell us a safe limit for cell phone use.

专家仍然不清楚手机使用的安全极限是多少。

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Austria's corresponding safe limit is set at 100 micrograms.

奥地利的相应安全上限为100微克。

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Benzene levels in its soilare said to be 43,000 times the safe limit.

东部地区土壤里的苯含量据说超过安全限制43,000倍。

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The highest electromagnetic radiation reading it found was a seventh of the internationally agreed safe limit.

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And according to the Planetary Boundaries concept, the nitrogen cycle is already one of the places where humanity has already broken through the "safe limit".

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The test found that it contained nearly 4, 000 micrograms per litre of carbon tetrachloride - nearly 1, 000 times the World Health Organisation's safe limit.

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