翻译: 据估计，将有50多万国内外客人来参观2010年上海世博会。(It…)

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问题解答：

It is estimated that there will be more than 50 million domestic and foreign guests to visit the World Expo 2010 Shanghai

It is estimated that there will be more than 50 million domestic and foreign guests to visit the World Expo 2010 Shanghai.就是这个！

It is estimated that there would be more than 50 thousand of locals and foreigners to be there to explore at 2010 world expo in shanghai.

翻译:It is estimated that there will be more than 50 million domestic and foreign guests to visit the 2010 Shanghai World Expo.