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| septic tank A tank, usually underground, into which sewage flows, the deposited matter being wholly, or partially broken down through anaerobic action. The final effluent may be allowed to soak into the ground through a system of agricultural drains, if the soil is suitable. Alternatively, the tank must be emptied at regular intervals by a special road-tanker (一个罐子，通常在地底，在罐子里污水全部或部分发酵分解。如果土壤适合，最后剩余的液体可能通过农业排水系统渗透到土里。反之，罐子必须定期通过特殊的运输车来清空。) | |||
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