有些人认为接触射频的危险性可能存在，甚至可能很严重。

Some people perceive risks from RF exposure as likely and even possibly severe.

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然而，甲型肝炎病毒感染也可能很严重，甚至会威胁生命。

However, HAV infections can also be severe and life threatening.

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而且，治疗的副作用有可能会很严重，甚至致死。

And the side effects of the treatment can be serious, sometimes even causing death.

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但是甚至最低的水平可以有很严重的伤害。

But even the lowest levels can do serious damage.

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但是甚至最低的水平可以有很严重的伤害。

But even the lowest levels can do serious damage.

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