霏霏头头
This company is our regular customer.这家公司是我们的老客户。She has been a client of our bank for ten years.她已经成为我们银行十年的老客户。You have quite a lot of regular customer so far as I know.据我所知，你们有许多老客户。We always dislike refusing requests of any kind from regular customers, but regret we have no choice but to do so.我们一贯不愿拒绝老客户们提出的任何要求，但遗憾的是我们别无选择，只能拒绝上述请求。Additional Words and Phrasespolicy-holder保险客户potential clients; expected income.可能的客户；预期收入。Salespeople visiting their accounts.推销员拜访了他们的客户A creditable customer.一个信誉卓著的客户I call up a client.我打电话给客户。Our customer is very select.我们的客户是精心挑选的。
吐司酸奶
其实说法有很多种，只要能表示其意就行，其比较象形的词有：familiar,and frequenter 都有这种意思。Solid partner 这句从表面词意上是指搭档，经常合作者，当前是高频率地用于欧美企业之间，也表常客的意思，但我们通常指老客户。语言这东西对同一词有多种翻译，就象我们的汉语，用个引申意思的词也行。usual customer只是一个纯粹的中译英，老外是看不懂的。
素雪清芳
frequent customer old customer usual 意思是 Usual is used to describe what happens or what is done most often in a particular situation. 更强调与事情经常发生, usual customer很少见, 不过usual customer care/service 倒是常用
