No. 667 in Chinese
封
"封" means "to seal," "to enclose," or "a measure word for letters."
In a sentence
我刚收到一封信。
I just received a letter.
'封' is a measure word used here to quantify '信' (letters).
这个房间被封起来了，不能进入。
This room has been sealed off and cannot be entered.
'封' is used here as a verb meaning 'to seal' or 'to block off'.
他在门上贴了一封告示。
He posted a notice on the door.
Here, '封' functions as a descriptor for the notice, specifying its form or style.
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