technical structures around the reservoir are ready for operation |
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| navigate by keyword : technical structures reservoir are ready operation process factory threatening natural beautiful landscape dirty flood large swim traditional pool pet red system machine wheel threat classification industrial environment outdoor treatment water lake flow industry equipment pipe drain plant fish clean oxygen farm pond pump construction tube sewage aquatic gushing pipeline groundwater sewer stream goldfish agriculture hobby purification sunny day |
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| Water purification system on a sunny day lake |
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