In recent years, a number of leaks of radioactive water have stoked environmentalist ire, though local residents were not exposed to dangerous doses of radiation.

最近几年，好几次核辐射水漏洞事件激怒了许多环保人士，虽然当地居民并没有受到辐射的危险。

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Drugs that are safe in the dosage stated on the label may be very dangerous in large doses.

服用标签上的剂量很安全，但大量服用就可能有很大风险。

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Radiation doses below 100 millisieverts are not considered dangerous, and Tashiro said that thyroid cancer will therefore probably not increase in the future.

而辐射量在100毫西弗（millisieverts）以下被认为没有危险性。 田代说，甲状腺癌发病率未来不会有增加的趋势。

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But high doses are dangerous.

WSJ: Radiation's Effect Depends on Amount

So if this is the case, why did EPA fail to warn their test subjects that the substances they would be exposed to in high doses were so dangerous?

FORBES: EPA Charged With Lethal Experiments On Hundreds Of Unsuspecting Subjects

We already have some pretty good evidence that caffeine, in high doses, can be dangerous, especially for kids and teens.

FORBES: As Caffeinated Gum Hits The Shelves, FDA Jumps To Attention