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波音公司已声称要研制Ｍ０．９５的“音速巡航者”，为此，ＧＥ、普惠和罗－罗公司都在研究各自有关的发动机方案和新技术，以便做好参预竞争的准备工作
Boeing has claimed to have developed the M0.95 “Sonic Cruiser” and GE, Pratt & Whitney and Lockloom are studying their respective engine solutions and new technologies to prepare for the competition.