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The sun is a giant nuclear fusion reactor, converting hydrogen into helium and releasing massive amounts of energy in the form of heat – and sound. Sound is essentially vibration and needs a medium to travel through.
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但他也提醒，白宮的追蹤數據「包含可能最終不會實現的投資承諾」。他舉例說，歐盟的貿易協議就是一例，該協議因特朗普最新的關稅威脅而被擱置。