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。
You may notice things (scratching your nose, saying the odd um and ah) that were not that noticeable in the live presentation.
你还会注意到一些现场注意不到的细节(挠鼻子，说“嗯”“啊”之类)。
He has this irritating mannerism of constantly scratching his nose.
挠鼻子，这个习惯真让人不舒服。
He has a trick of scratching his nose when he's angry.
他生气时有抓鼻子的习惯。
He has a trick of scratching his nose when he's angry.
他生气时有抓鼻子的习惯。
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