Level 18
Level 20
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先生
Mr
寄
to send
信
letter
航空信
air letter
平信
surface letter
封
measure: letters
还是
or
纪念
to commemorate
邮票
postage stamp
套
measure: a set
沓儿
measure: a pile
信封
envelope
信纸
letter-paper
信箱
postbox
里边
inside
外边
outside
