無詞性
A microexpression is a brief, involuntary facial expression shown on the face of humans according to emotions experienced. They usually occur in high-stakes situations, where people have something to lose or gain. Microexpressions occur when a person is consciously trying to conceal all signs of how he or she is feeling, or when a person does not consciously know how he or she is feeling.  They are very brief in duration, lasting only 1/25 to 1/15 of a second.

詞條貢獻者： lizongxi  
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