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| mud accumulation | |||
| sludge buildup | |||
| sludge buildup (в отстойнике) | |||
| sludge deposits (на дне водного объекта, в отстойнике); sludge buildup (на дне водного объекта, в отстойнике) | |||
| накопление ила: 2 phrases in 1 subject |
| Natural resourses and wildlife conservation | 2 |
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