Rule number one: The customer is always right.

第一条：顾客永远是对的。

youdao

Rule number two: When the customer is wrong, refer to rule number one.

第二条：如果顾客错了，请参照第一条。

youdao

Rule number one: The work has to teach you something useful to your art.

第一条：工作必须给你的艺术带来有用的知识。

youdao

As we all know, this only works if there is a pointee, which kind of gets back to rule number one.

众所周知，只有当有指针数据时，这个才起作用，这有点像第一条规则。

哈佛公开课 - 计算机科学课程节选

Rule number one for the perfect day in Boston: do not even think about driving a car around here.

BBC: A perfect day in Boston

Camp rule number one:All guests must play hard--and work hard.

FORBES: Catch and Release

Memo to Big Entertainment: In case you missed this in business school, rule number one in sales is try not to induce nausea on the part of your prospective sales targets.

FORBES: What To Do When Your Customers Flock to the Cloud? Hopefully, You Don't Sue Them