他写了一封非常正式的道歉信给道格拉斯。

He wrote a very formal letter of apology to Douglas.

《柯林斯英汉双解大词典》

但是第三者的角度，我不认为他有责任做出正式的道歉，如果他不愿意。

But from a third person perspective, I don't think he is obliged to make official apology if he didn't feel like to.

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外交部同时表示，戈登·布朗首相对该事件的发生表示遗憾，剑桥大学副校长来到中国大使馆进行了正式的道歉。

The foreign ministry said Gordon Brown had also expressed regret for the incident and the university's vice-chancellor had visited the Chinese embassy to offer a formal apology.

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