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SUPER SCIENCE

The hole in your plastic stool is for ...

作者:teens
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塑料凳中间的小洞洞有什么用?

Plastic stools (塑料凳) are common in most homes. Many families have a few. Many small restaurants also have these stools. Plastic stools are light and easy to use. Most stools have small holes on its surface. Why do stools have these holes?
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