说下水道是一个城市的良心。看得到的繁华都市，看不到的地下体系，大概和人心隔肚皮一个道理吧。
Sewer system is like an underground city, a shadow, reflects the conscience of the city. You can see the flourishing city, you can’t see what’s beneath it. Just like you can see someone’s appearance not their hearts.
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