我们之所以要学习外语，是因为它们已成为引进先进思想和科学技术的媒介。
The reason why we should learn foreign languages is that they have become a vehicle for bringing in advanced ideas, science and technology.
我们之所以要学习外语，是因为它们已成为引进先进思想和科学技术的媒介。
The reason why we should learn foreign languages is that they have become a vehicle for bringing in advanced ideas, science and technology.
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