越来越多的人使用它作为交流工具。

More and more people use it as a communicating tool.

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作为交流工具，交流自然是重点，也是Twitter最成功的服务。

It's a communication tool so of course conversation is a focal point that Twitter is most successful at.

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在国际交往日益频繁的现代社会，英语作为交流工具其作用越来越重要。

English, as a widely-accepted global language, has become the most important communicative tool in the world.

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