He had every reason to be angry.

他完全有理由感到愤怒。

《牛津词典》

This was their mother at her worst. Her voice was strident, she was ready to be angry at anyone.

这是他们的母亲最糟糕的情形。她声音刺耳，随时会对人发脾气。

《柯林斯英汉双解大词典》

She had every right to be angry.

她完全有理由生气。

《牛津词典》

It means to treat a person kindly or gently, especially in a situation where you might be expected to be angry with him.

VOA: special.2010.08.29

Oh my god, he's gonna to be so angry.

天啊，他肯定会生气的。

耶鲁公开课 - 死亡课程节选

The president referred directly to last week's political setback, acknowledging that voters have a right to be angry.

VOA: standard.2010.01.28

Not only does Aventis feel that Sanofi's (nyse: SNY - news - people ) bid is too low, it also appears to be angry that its rival decided to launch a hostile offer at all.

FORBES: If Novartis Steps In, Will Pfizer Follow?

Folks are going to be frustrated and some folks are going to be angry.

WHITEHOUSE: A First-Hand Look at the Federal Response to the BP Oil Spill

My first impulse was to be angry at MIT, where I went to college.

FORBES: Does Making Aaron Swartz A Martyr Endanger Other Suicidal People?