Space tourism company Virgin Galactic on Monday announced a partnership with engine-maker Rolls-Royce to build a supersonic commercial airplane that flies at three times the speed of sound.
"We are excited to unveil this initial design concept of a high speed aircraft, which we envision as blending safe and reliable commercial travel with an unrivalled customer experience," said George Whitesides, chief space officer at Virgin Galactic.
The aircraft’s draft design showed a plane with a triangular "delta wing" carrying between nine and 19 passengers at an altitude of more than 18,000 meters － about twice as high as normal commercial flight.
Virgin Galactic said its team would "work to address key challenges in thermal management, maintenance, noise, emissions, and economics that routine high speed commercial flights would entail."
revive：動詞，復興、復甦。例句：To revive tourism, the government announced travel subsidy scheme.（為了復甦觀光業，政府宣布旅遊補助計畫。）
unrivalled：形容詞，無與倫比的。例句：We wished you can have a unrivalled experience in the villa.（我們希望您可以在這座度假村中，擁有無與倫比的體驗。）
entail：動詞，必須、牽涉。例句：Rebuilding the village will entail spending a lot of time.（重建這座村莊必須耗費許多時間。）