| 摘要 |
An envelope formed from a transparent sheet is disclosed, such that the edges of the envelope are formed with holes whereby a potentially harmful substance contained therein may be withdrawn via at least one of the holes without tearing the envelope. A method for preventing a potentially harmful substance contained within a transparent envelope from harming bystanders is also disclosed. In one aspect, the method involves visually detecting a potentially harmful substance in the envelope, applying a vacuum to the inside of the envelope, whereby the potentially harmful substance contained therein is discharged through holes into a sealable enclosure for inspection and testing, and discarding the envelope together with its contents if the test reveals that the substance is harmful. In another aspect, the method involves irradiating the envelope with radiation whereby to kill any possible pathogens found within the envelope. In another aspect, the method involves testing the air quality within a mail receptacle, whereby the air quality is indicative of the presence of a harmful substance in an envelope disposed within the receptacle, and secluding a plurality of envelopes if the test reveals a presence of a harmful substance in the receptacle. |
