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Circle shape design is easier to maintenance

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No corner so it would be more safe

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Frog can see outside

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easy to produce

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Just physics

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close easily

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because it can distribute soil pressure

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Easier for the repairmen to go in and out

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Harmony

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More safety in real life, portable in fixing

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Easy for people go inside

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Good for design

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prevent accidental cut from edges and corners

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Easy to produce round-shaped well covers

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Water easily flows into the underground

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Easier entry and exit for workers to do the construction or repair

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spend less cost on the materials.

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Employees can get stuck here

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So you can roll the heavy manhole cover

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easy to move

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Structural integrity

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To save time