The full-size hoverbike will be powered by a gasoline engine turning an alternator to provide power for its four electric rotors.
全尺寸翱翔车将由汽油发动机启动的交流发电机为其四个回转轴供能。
英语百科
Engine turning
Engine turning refers to a fine geometric pattern that can be inscribed onto metal as a finish. Aluminium is often the metal chosen but any metal can be finely machined to produce intricate repetitive patterns that offer reflective interest and fine detail.