1. The fins of the shark are made of tough, flexible sharkskin.
鲨鱼的鳍是由坚韧、柔软的鲨鱼皮制成的。

2. The swimmer wore a swimsuit made from sharkskin to help reduce drag in the water.
游泳者穿着一件用鲨鱼皮制成的泳衣，以帮助减少在水中的阻力。