Much meaning can be conveyed, clearly, with our eyes, so it is often said that eyes can speak.
Do you have such kind of experience? In a bus you may look at stranger, but not too long. And if he is sensing that he is being stared at（凝视，盯住）, he may feel uncomfortable.
The same in daily life. If you are looked at for more than necessary, you will look at yourself up and down(从上至下), to see if there is anything wrong with you. If nothing goes wrong, you will feel angry toward other’s stare with you that way. Eyes do speak, right?
If a speaker looks at you continuously when speaking, as if he tries to dominate you, you will feel disconcerted（adj.不安的，惊慌的）. A poorliar（n.说谎者）usually exposes himself by looking too long at the victim, since he believes in the false idea that to look straight in the eye is a sign of honest communication. Quite the contrary.
In fact, continuous eye contact is confined to lovers only, who will enjoy looking at each other tenderly for a long time, to show affection that words cannot express.
Evidently（adv.显而易见地）, eye contact should be done according to the relationship between two people and the specific situation.
