求翻译：That's why I'm pleased to announce that the United States will dramatically expand the number of our students who study in China to 100,000. And these exchanges mark a clear commitment to build ties among our people, as surely as you will help determine the destiny of the 21st century. And I'm absolutely confident that America has no better ambassadors to offer than our young people. For they, just like you, are filled with talent and energy and optimism about the history that is yet to be written.是什么意思？

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