A microexpression is a brief, involuntary facial expression shown on the face of humans when one is trying to conceal or repress an emotion.

• 微表情是人在试图隐藏或者控制某种情绪时不自觉地表现出来、且持续时间很短的一种面部表情。微表情通常会在人们经历得失、情势危急的时候出现。