There is one exception to this general principle.

这个一般性原则有一例外。

《牛津词典》

In other words, he figured it was an exception to the rule.

换句话说，他认为这是规则的一个例外。

youdao

Few doctors would have thought that there might be an exception to this.

很少有医生会想到，这可能会有例外。

youdao

"Impunity is the norm." "The few perpetrators that have been held accountable are the exception to the rule.

VOA: standard.2009.09.12

But what I'm going to tell you already is this is a case where, in fact, it's an exception to the idea that the lowest energy structure has the lowest ionization energy in the middle, and we can figure this out when we look at formal charge.

但是我已经告诉大家这个例子，实际上，是中心原子电离能最低的结构,的能量最低这一思路的一个例外，我们可以通过形式电荷看出这一点。

麻省理工公开课 - 化学原理课程节选

The only exception to this would be

特例只有一种，

退休很神奇 - SpeakingMax英语口语达人

Allowing companies an exception to the CFAA really would turn the Internet into the Wild West.

FORBES: Caution: Active Response to Cyber Attacks Has High Risk

The hoary slogan 'Not sold in stores' has become the exception to the rule.

FORBES: The Infomercial Triumphant

We do have one exception to this, to football (what Americans would call soccer) matches.

FORBES: London Olympics Tickets: Mispriced and Sold to the Wrong People