flashed his teeth, The dog showed his teeth when the stranger came too close., facial expressions, The looks on your face are very important for nonverbal communication., repress your emotions, You can try not to show what you feel but you can't get rid of the emotions., frowned, He didn't expect to get such a high bill and wrinkled his forehead, a voluntary movement, Raising your hand in class is sth you do on purpose, unlike blinking, which happens automatically

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