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英译汉一句Because these reactions are reported voluntarily from a

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英译汉一句
Because these reactions are reported voluntarily from a treatment population of unknown size ,it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure
英译汉一句Because these reactions are reported voluntarily from a
因为这些反应是由接受治疗的人群(具体数量不得而知)通过个人感受而得出的报告,因此要准确预计他们的频率或建立药物暴露后的因果关系的资料几乎是不可能的.
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