HSK 3
封
fēng量（动）
to confer; to grant; to bestow a title; to seal; classifier for sealed objects, esp. letters; surname Feng
桌上放着一封老师的信。
Zhuō shàng fàng zhe yì fēng lǎo shī de xìn.
A letter from the teacher is lying on the table.
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Appears across levels (3（6）) in the HSK 3.0 word list.