Building sister­city relationships was one of the ideas put forward by President Eisenhower. On September 11 and 12, 1956, he established the program, the “People­to­People” program, at a White House conference.

　　Soon, establishing sister­city relationship became very popular. Today, it is involved with programs in 134 countries. 700 American communities have partnerships with almost 1,800 communities in other countries. Atlanta, Georgia, for example, has 18 sister­city partnerships. One is with Brussels, Belgium. Another is with Lagos, Nigeria. These two relationships have existed for more than thirty years. The areas they involve include economic development and trade. Within the past fifteen years, more American cities have created partnerships in developing countries. Projects have involved water quality, health care and good government. In Africa, projects might also deal with AIDS and HIV.

　　Some sister­city relationships are fifty years old. And now there are even “cyber sister cities” — partnerships created over the Internet. They mainly develop their economy and culture. There are more than 100 cities developing this kind of relationship. Title: 1.__________

　　Definition A win­win relationship between 2.__________.

　　3.__________ *To learn from each other and solve problems together；

　　*To 4.__________；

　　*To increase international understanding and friendship；

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