fold of incus

例句：

1. 1.The ancient Chinese had a unique way of folding their clothes for warmth.
   古代中国人有一种独特的折叠衣服来保暖的方式。
2. 2.The fold of the wings is crucial for flight.
   翅膀的折叠对于飞行至关重要。
3. 3. The folding machine is used to fold paper into different shapes.
   折叠机用于将纸张折叠成不同的形状。