Rescue sites will often be unstable and hide many dangers: broken glass, protruding nails, weakened floors or stairs, downed electrical wires, escaping gas, broken sewer and water pipes.

需救援的地点往往不坚固，且潜藏着危险：碎玻璃，扎出来的钉子，脆弱的地板和楼梯，掉落的电线，泄漏的燃气，破损的下水道和水管。

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Trimethylamine (TMA) gas is the main gas come from deterioration of fish and one of the major odor gases existing in urban sewer.

三甲胺(TMA)气体是鱼类水产品变质后释放的主要气体，也是城市下水道释放的主要恶臭气体之一。

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Trimethylamine (TMA) gas is the one of major odor gases existing in urban sewer. Recent researches in TMA gas sensor focus on inspecting freshness of fish.

三甲胺（TMA）气体是主要的城市下水管道恶臭物质之一，目前对三甲胺气敏材料的研究主要集中在鱼鲜度的测定。

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This more strategic approach would help officials decide, for instance, whether to upgrade gas mains, sewer lines or street lights in certain areas costly decisions that will need to be carefully weighed.

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Hoping to save yearly operating costs by combining utilities, the city shifted control of its water and sewer system to a not-for-profit trust that also runs the local natural gas.

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