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我是个遇事爱问为什么的孩子。一天,我在楼下玩,突然对下水道产生了兴趣,蹲在旁边看了半天。我发现所有的井盖都是圆形的。为什么不设计成正方形或三角形等形状呢?那各种形状的下水道井盖还能给城市增添一道风景呢!
I am a child who asks why One day, I was playing downstairs and suddenly had an interest in the sewer. I squatted aside for a long time. I found all the covers are round. Why not design into the shape of a square or triangle? Sewer covers of various shapes can also add a view to the city too!