The helicopter, named GEN H-4, has a set of two rotors turning in opposite directions and can fly at a maximum speed of 50 kilometres (31 miles) per hour.
这架代号为GEN H - 4的直升机有两个向相反方向旋转的旋翼，最高飞行速度可达每小时50公里。
One taken by Paul Haviland in New York in 1909 (in Clarence H. White's atelier) shows the dancer Faico, his knees slightly bent, his arms holding opposite curves.
1909年保罗·哈维兰在纽约(在克拉伦斯·h·怀特的画室)拍摄的一张照片展示的是舞蹈家Faico，他的膝盖微微弯曲着，手臂保持着反向曲线。
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