老顾客的英文：
a regular; a regular customer

参考例句：

Laura was one of his regular customers.
劳拉是他的老顾客之一。

Our shop provides our old customers with a premium card, with which they may get unconventional enjoyment.
本店为老顾客提供超值享受的优惠卡。

The barman gave free drinks to the regulars at Christmas.
圣诞节酒吧男侍者免费给老顾客酒喝。

regular是什么意思：
adj. 定期的；有规律的；频繁的；平常的；规则的，整齐的；中份的；常规的
n. 常客；正式成员

Please regular the sound on that recorder.
请调节录音机的音量。

They run regular services.
它们提供有规律的服务。

Not regular or fixed;occasional
不规则的；非固定的；临时的

A soldier belonging to a regular army.
正规军士兵。

A regular polyhedron has congruent faces.
规则的多面体有相同的面。

customer是什么意思：
n. 顾客；家伙

Once is no custom
一次不成例

Customize a van.
定做一辆大马车

Customs officers are in charge of the customs inspection.
海关官员负责海关检查。

credit a customer with 8
把8英镑记入客户贷方

Our baggage has cleared customs.
我们的行李已通过海关检查。