那些费尽心机从下水道和污水管收集地沟油的人知道，在一个食品涨价令餐馆和消费者备受冲击的国家，食用油具有何等价值。
Those people drudging it up from the drains and sewers know its worth in an economy in which rising food prices have hit restaurants and consumers hard.
唔，污水管道是全封闭的系统，和暴雨下水管道完全分离。
Well wastewater sewage is a closed system. It's completely separate from the storm drains.
新的污水处理厂和下水管道被建立了。
New water-treatment plants were built and sewage pipes laid.
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