| 摘要 |
For a biological contamination by mail of a person to who it is addressed an envelope is used which has a material which forms an envelope with a closed inner space, and at least one throughgoing opening provided in the material so as to communicate an interior of the envelope with its exterior so that if a particulate material is introduced into the interior of the envelope it will discharge through the at least one through going opening outwardly and the particulate material will not stay in the interior of the envelope.
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