封信封、瓶口；封伤口to seal; to heal
信还没封口。
The letter hasn't been sealed yet.
腿上的伤已经封口了。
The leg wound has healed.
闭口不谈to keep silent
他没封口，还可以商量。
He's still talking about it, so there should be room for discussion.
信封等的封口seal
信件的封口要粘牢。
Make sure the envelope is sealed.
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