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これの話だろ　↓　DXだから実証不要、とか言っててこれか…
イギリス側実証機のエンジンは無改造のEJ200をそのまま使うそうで

This was trialled in combination with an unmodified Eurojet EJ200 turbofan – sourced from a Royal Air Force (RAF) Eurofighter Typhoon – at R-R's Filton site near Bristol.