（例）Today, I’ll show you what we learned about sharks.//
　You might think sharks have smooth skin.// But this is not true.// Actually, it’s very rough compared to the skin of other fish.// Small raised zigzag edges on the skin surface reduce water resistance.// That is why sharks can swim fast.//
　A sportswear company got an idea from the shark’s skin and created far better swimwear.// However, the swimmers who wore the swimwear swam so fast that the swimwear was banned from competitions.// Thank you for listening.//