19

　　Someone who has tried to set such rules is the American, Professor Paul Ekman, who built database of how the face moves for every emotion．The face can make 43 distinct muscle movements．Ekman has also found that it may not be possible for people to reproduce them artificially．The most difficult expression to reproduce is the smile．It isn't only about stretching the lips, but tightening the tiny muscles around the eyes．

　　20

　　If we learnt to recognize whether someone was using their eye muscle when they smiled, we would be able to distinguish true enjoyment from false．

　　A．It shows 412 distinct ways we feel．

　　B．These can be combined into more than 10,000 facial shapes．

　　C．These particular muscles are difficult to control, and few people can do it．

　　D．They decided that it was a mental state that could be introduced by "I feel" or "he looks "

　　or "she sounds"．

　　E．He said the expression of these feelings was universal and recognizable by anyone, from

　　any culture．

　　F．It is as if they are programmed into the brains of "normal humans" wherever they are and

　　whatever their races．

　　G．We thought of trying to describe each emotion, but it would have been almost impossible

　　to make clear rules for this．

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