When (meet) people at the airport, most people will smile and shake handspeople they meet. We know that a smile is usually a sign that people feel friendly and happy. But is always unclear is who the new person is. What if we are not introduced by a friend? What if we are meeting a stranger in unfamiliar place? Sometimes people are (danger) and humans have to find ways to protect (them). We have to make sure we can trust people we do not know, and we have to show that we are not aggressive. Showing our hands means that we are not armed(武装的). In many (culture) today, the Western custom of shaking hands (use). We use our right hand, which is usually(strong) than the left one. If we are using our hand this way, it means that we cannot be holding a knife a gun. It shows that we trust the other person, and that the other person can trust us.
