It is a twin-seat, twin-engined aircraft with a variable geometry swing-wing that is capable supersonic flight at all levels.

这是一个双座位，可变几何摆动翼是能在各级超音速飞行的双引擎飞机。

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Media reports suggest that the mishap occurred when the single-engined aircraft was caught by a gust of wind while hovering a few feet above the ground before landing.

媒体报道显示，事故发生时这架单引擎飞机正在离地几英尺的空中悬停准备降落，此时遇到了阵风。

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Comac's chief designer Wu Guanghui has declined to be drawn into comparisons with the A320neo, saying that while the A320neo is a re-engined aircraft, the C919 is a brand new product.

商飞首席设计师吴光辉谢绝同a 320ne o作比较，他强调A 320neo是动力升级版飞机，C919是新型号。

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The trend towards more twin-engined aircraft drives up the cost of engine development, by boosting the need for power and reliability.

ECONOMIST: Aircraft engines

The crew were flying their twin-engined aircraft on a night-time cross country navigation exercise out of RAF Kinloss in Moray on 13 April.

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However, multi-engined aircraft - like the one that crashed - can be provided with ATC clearance to fly elsewhere in the London Control Zone.

BBC: London helicopter crash: What are the rules for pilots?