Chikapapa's Choice

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8月 22
マッハ20！。ちなみに光速はマッハ88万だそうで。(via Superfast US military plane reaches Mach 20 speed, then crashes – Boing Boing)

マッハ20！。ちなみに光速はマッハ88万だそうで。(via Superfast US military plane reaches Mach 20 speed, then crashes – Boing Boing)

Posted 9ヶ月前