seal an envelope 把信封上
Envelope closure seal and method 发明名称
l Seal the envelope 把两部分粘住
Don't forget to seal the envelope.
别忘了把信封封好。
youdao
You must seal up the envelope before mailing the letter.
你在寄信前必须先将信封密封。
Once you're done, sign off your name with today's date. Safe keep your letter. Put the papers in an envelope. Seal it.
写完后，别忘了在名字下面写上今天的日期。妥善保管你的信件，把信纸放在信封里，封上信封。
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