In recent years, sewage gas explosion occur in many Chinese cities.
近年来，我国大中型城市时常出现下水道爆炸事件。
Broken electrical, water, gas, and sewage lines that can result in injury or illness; and.
破损的电，水，气，污水管道能够导致受伤或患病；并且。
Broken electrical, water, gas, and sewage lines that can result in injury or illness; and.
破损的电，水，气，污水管道能够导致受伤或患病；并且。
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