Touching or scratching the nose or behind their ear.
碰或抓鼻子或耳后。
Such a task meant giving a TV, for example, a way to identify people sitting on a couch and to recognize a certain hand wave as a command and not a scratching of the nose.
例如，对电视来说，就需要识别坐在沙发上的人，识别作为命令的手势，防止把观众挠鼻子的小动作误认为手势命令。
He kept scratching his nose until it became very red.
他不停地抓他的鼻子，直到它变得很红。
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