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1380100 jmdict A [id=2209667] 精通[ichi1,news1,nf21] せいつう[ichi1,news1,nf21] [1][n,vs,vi] being well versed (in); being well acquainted (with); being familiar (with); having a thorough knowledge (of); being an authority (on) [2][n,vs,vi] (a boy's) first ejaculation; spermarche; semenarche