他们不拘限于照片的表现。这是我的印象。
I am under the impression that they are not restrained to photographic expression.
要拍摄人物表现自然、不对镜头摆姿式的照片，抓拍很关键。
For pictures of people behaving naturally, not posing for the camera, it is essential to shoot unnoticed.
在一项经典研究中，保罗·埃克曼拍下了人们表现出愤怒、厌恶、恐惧、快乐和悲伤等情绪的照片。
In a classic research, Paul Ekman took photographs of people exhibiting the emotions of anger, disgust, fear, happiness, and sadness.
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