Update README.md

README.md

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 ### Dataset Summary
 
-The dataset covers 20,000 hours of accented english data. It's collected from native speakers in more than 20 countries, such as USA, China, UK, Germany, Japan, India, France, Spain, Russia, Latin America, covering a variety of pronunciation habits and characteristics, accent severity, and the distribution of the speakers.
+The dataset contains 20,000 hours of accented English speech data. It's collected from local English speakers in more than 20 countries, such as USA, China, UK, Germany, Japan, India, France, Spain, Russia, Latin America, covering a variety of pronunciation habits and characteristics, accent severity, and the distribution of speakers.The sentence accuracy is over 95%.                                                                           For more details, please refer to the link: https://www.datatang.ai/dataset/speech/english%20speech/
 
 ### Supported Tasks and Leaderboards
 
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 [More Information Needed]
 
 ### Contributions
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-Thanks to [@github-username](https://github.com/<github-username>) for adding this dataset.