chēnghu shí yào bǎ liǎng gè zì yīqǐ dāng xìng bǐrú ōuyáng lǎoshī bùyào suíbiàn chāichéng ōu lǎoshī

称呼时要把两个字一起当姓，比如“欧阳老师”，不要随便拆成“欧老师”。

When addressing someone, treat the two characters of a compound surname together, like 'Teacher Ouyang', and do not split it into 'Teacher Ou'.