（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.
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.