暴露于人为原因的过热环境下 Exposure to excessive heat of man-made origin
暴露于人为原因的过冷环境下 Exposure to excessive cold of man-made origin
但皱眉产生的主要原因还是因为在阳光下的暴露和年龄。
But for the most part, wrinkle lines are due to sun exposure and age.
如果由于某些原因，您不想在URL中暴露这个unid，那么就必须在unid属性中明确地说明文档标签。
If for some reason, you do not want to expose the unid in the URL, you must supply it somehow to the document tag explicitly in the unid attribute.
再一个原因是与通常的医学治疗相比，核辐射造成的暴露是不由自主的。
Another reason is that in accidents, as opposed to medical treatments, exposure to radiation is involuntary.
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