去年，国际留学生大约为美国经济注入了一百九十亿美元的资金。

International students put an estimated nineteen billion dollars into the American economy last year.

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另一个困难在于资金：它可以花费大量的留学生活。

An added difficulty lies with finance: it can cost a lot to study abroad.

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所以，很多大学生课余工作能为他们的研究资金。

So, many college students work after class to get money for their studies.

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所以，很多大学生课余工作能为他们的研究资金。

So, many college students work after class to get money for their studies.

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