精通， せいつう

1. being well versed (in), being well acquainted (with), being familiar (with), having a thorough knowledge (of), being an authority (on) 2. (a boy's) first ejaculation, spermarche, semenarche

tbd

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音读: ショウ   セイ  

训读:しら.げる  くわ.しい  

日检:2 grade:5 笔画数:14 部首:119

音读: ツ   ツウ  

训读:-どお.り  かよ.う  とお.る  とお.す  とお.し  とお.り  -とお.り  -どお.し  

日检:3 grade:2 笔画数:9 部首:162