Researchers trained a group of 11 dogs to distinguish between images of the same person making either a happy or an angry face.

研究人员对11只狗进行了训练，区分同一个人快乐或愤怒表情的图像。

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I'm not usually a hot-headed person but I really got very angry.

我通常不是一个头脑发热的人，但我真的很生气。

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Acalm, rational person may appear to transform into an angry beast in a trafficjam because of that need to protect oneself, said Dr. Tracy Latz, psychiatristin Charlotte, North Carolina.

一个平静、通情达理的人可能会在交通堵塞时转变成一个愤怒的野兽以保护他(她)自身，北卡罗来纳州夏洛特市的心理学家特蕾西.莱兹 (Tracy Latz) 博士如是说道。

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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

Or the person might have had a very frightening experience, like being chased by an angry dog.

VOA: special.2010.06.20

Yet,even though you may be angry, I would know that at heart, you are a kind person.

VOA: special.2010.07.11

Engagement behaviors indicate interest, receptivity, or agreement while disengagement behaviors signal that a person is bored, angry, or defensive.

FORBES: The Body Language of Disengagement--and How to Deal With It

Disengagement behaviors (looking away, leaning back, narrowed eyes, frowns, etc.) signal that a person is bored, angry, or defensive.

FORBES: How Savvy Negotiators Read Your Body Language

Asians are more likely than Westerners to regard a person who makes eye contact as angry or unapproachable, says a 2013 study in the online scientific journal PLOS ONE.

WSJ: The Decline of Eye Contact