zhè / ge / cí / bǐ / jiào / jiù / guò / qù / cháng / yòng / gù / zhǔ / lái / chēng / hu / gù / kè

这个词比较旧，过去常用“顾主”来称呼顾客。

This word is rather old; in the past, 顾主 was often used to refer to customers.