Fig4. Self-seal means adhesive tapes attached, so not the mails but you should accomplish the sealing job instead of open-wide delivery.
自封信封意思是信封口上面带着双面胶，不是信封自己会把自己封上，不要敞着就寄出去了。
Fig4. Self-seal means adhesive tapes attached, so not the mails but you should accomplish the sealing job instead of open-wide delivery.
自封信封意思是信封口上面带着双面胶，不是信封自己会把自己封上，不要敞着就寄出去了。
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