The short story "The Vast Blue Sky" revolves around the bird-watching hobby of Mr. Khang and Mr. Tho, old friends who share the same hobby. However, from this hobby, Mr. Khang and his grandson realized that birds only really sing beautifully and bring clear sounds when flying in the blue sky. What are the details of the story? Please listen to it right away through the voice of Hoang Thuong.
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