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What is the sound barrier, and how is it broken?
In 2025, an American company, Boom Supersonic, successfully conducted its first supersonic flight over California. The ...
(Yicai) Feb.18-- China's 2026 Spring Festival box office, including presales, had topped CNY1 billion (about USD144 million) by yesterday morning, just three days into the nine-day holiday, according ...
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