Sticking means sticking paper or other things to another thing with glue, paste, etc.
Envelope generally refers to a kind of bag-like packaging that people use to send letters and keep the contents of letters confidential. Envelopes are usually made into rectangular paper bags It also refers to the envelope basin (Sichuan basin), the book Envelope published by Yilin Publishing House, and Trojan envelopes, such as QQ envelopes.
Extended data:
Envelope sealing form:
1, non-adhesive sealed envelope: a common envelope form in China.
2. Saliva glue sealed envelope: a common form of envelope abroad, with saliva glue at the seal.
3. Self-adhesive sealed envelope: the sealed part is coated with adhesive.
4. Self-adhesive sealed envelope (release paper envelope): the sealing part is coated with self-adhesive and the release paper is stuck on it.