Update README.md

README.md

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 ### Dataset Summary
 
-It is recorded by 219 American children native speakers. The recording texts are mainly storybook, children's song, spoken expressions, etc. 350 sentences for each speaker. Each sentence contain 4.5 words in average. Each sentence is repeated 2.1 times in average. The recording device is hi-fi Blueyeti microphone. The texts are manually transcribed.
+This dataset is just a sample of American Children Speech dataset(paid dataset) by microphone,recorded by 219 American children native speakers. The recording texts are mainly storybook, children's song, spoken expressions, etc. 350 sentences for each speaker. Each sentence contain 4.5 words in average. Each sentence is repeated 2.1 times in average. The recording device is hi-fi Blueyeti microphone. The texts are manually transcribed.
                                                                                                                              
-For more details, please refer to the link: https://www.nexdata.ai/datasets/speechrecog/75?source=Huggingface
+ For more details & to download the rest of the dataset(paid),please refer to the link: https://www.nexdata.ai/datasets/speechrecog/75?source=Huggingface
 
 ### Supported Tasks and Leaderboards