guàhào yóujiàn

== Mandarin == === Romanization === guàhào yóujiàn (Zhuyin ㄍㄨㄚˋ ㄏㄠˋ ㄧㄡˊ ㄐㄧㄢˋ) Hanyu Pinyin reading of 掛號郵件 / 挂号邮件