莱特兄弟通过使用一种叫做机翼变形控制（Wing Warping）的系统解决了这个难题，这个系统靠滑轮和绳索使机翼改变成不同的形状。
The Wright brothers did this using a system called wing warping, which relied on pulleys and cables to twist the wings into a different shape.
滑轮：力学上的一种装置，在边缘装有活动绳索、弦、缆、链条或带子的轮。
Pulley: in mechanics, a wheel that carries a flexible rope, cord, cable, chain, or Belt on its rim.
他们设计了一个绳索和滑轮系统，在学校毕业生游行经过露台时，拉起一张巨大的床单，上面画了一只巨大的手、比着中指问候。
They devised a rope and pulley system which raised a huge bed sheet on which was painted a huge hand flipping the middle-finger salute as the school's graduating class marched past the balcony.
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