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, 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, 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?
Looking too long at someone may seem to be rude and aggressive. But things are different when it comes to stare at the opposite sex. If a man glances at a woman for more than 10 seconds and refuses to avert（避免） his gaze, his intentions are obvious, that is, he wishes to attract her attention, to make her understand that he is admiring her.
However, the normal eye contact for two people engaged in conversation is that the speaker will only look at the listener from time to time, in order to make sure that the listener does pay attention to what the former is speaking, to tell him that he is attentive.
If a speaker looks at you continuously when speaking, as if he tries to dominate you, you will feel disconcerted. A poor liar 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, eye contact should be done according to the relationship between two people and the specific situation.
相关单词：avert
avert解释：v.防止，避免；转移(目光、注意力等)
avert例句：
He managed to avert suspicion.他设法避嫌。
I would do what I could to avert it.我会尽力去避免发生这种情况。
相关单词：attentive
attentive解释：adj.注意的，专心的；关心(别人)的，殷勤的
attentive例句：
She was very attentive to her guests.她对客人招待得十分周到。
The speaker likes to have an attentive audience.演讲者喜欢注意力集中的听众。
相关单词：liar
liar解释：n.说谎的人
liar例句：
I know you for a thief and a liar!我算认识你了，一个又偷又骗的家伙！
She was wrongly labelled a liar.她被错误地扣上说谎者的帽子。
