最終更新日：2024/07/29
The biofilm formed on the surface of the pond is causing the water to become stagnant.
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The biofilm formed on the surface of the pond is causing the water to become stagnant.
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The biofilm formed on the surface of the pond is causing the water to become stagnant.
The biofilm formed on the surface of the pond is causing the water to become stagnant.
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