The potato was unknown to the white man until he came to New World. Spanish explorers(探险者)found out some of the Indians in South America grown potatoes. The potato is one of the things that the South American Indians contributed to the world.
International security(安全）means protecting the international community from harm and danger and maintaining world peace.Looking after matters that affect international security is the main job of the UN Security Council(SC).At present,the SC is made up of 15 people representing 15 member countries.
Everybody loves good dreams. Think about what a nice dream is like: you fly to wherever you want; you float over some soft clouds, watching red leaves failing from the heaven. Being in one‘s own world, no one needs to be practical.As we are awake, there is still a world full of dreams, a fantasy world for us to escape from the real depressing, serious, dark life.