It was a flying toy made of cork and bamboo. The body was made of paper and the power was supplied by a rubber band.
这是一个由软木和竹子做成的飞行玩具，它的身体是用纸做的，动力由一个橡皮筋提供。
3
Scientists at Harvard and MIT have invented self-folding sheets of composite material that can flex themselves into toy boats, tents and even paper airplanes.