首日封 shǒurìfēng first-day cover Definitions Defs Origin Strokes Stroke Words Sentences Sents 首日封 shǒurìfēng first-day cover an envelope with new stamps postmarked on their first day of issue Frequency Written text 0.283 per million Sources Frequency data BCC Corpus (BLCU)
首日封 shǒurìfēng first-day cover an envelope with new stamps postmarked on their first day of issue Frequency Written text 0.283 per million Sources Frequency data BCC Corpus (BLCU)
