The words "the eyes are the window of heart". That is to say, we can read a person's heart, through his / her eyes. So the eyes are very important communication tool, can send some massage, his eyes almost unlimited. The language of the eyes can express complex emotions, which is an important method to determine the closest communication. Insufficient or excessive eye contact may cause barriers to communication. It is important, because it is showing close attention and influence. Eye contact pattern varies from culture to culture.
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