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.
如厕前要检查水管与下水道管道，确保它们完好无损。塞好浴缸与水槽的下水口，以免污水倒流。
Check to see that water and sewage lines are intact before using the toilet. Plug bathtub and sink drains to prevent sewage backup.
与深隧道系统，污水管网系统，在新加坡，将在不久将来，构成只有重力下水道相连的深层隧道。
With the deep tunnel system, the sewer reticulation system in Singapore will, in future, consist of only gravity sewers linked to deep tunnels.
与深隧道系统，污水管网系统，在新加坡，将在不久将来，构成只有重力下水道相连的深层隧道。
With the deep tunnel system, the sewer reticulation system in Singapore will, in future, consist of only gravity sewers linked to deep tunnels.
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