translation.en: Because once we build the first few water recycling systems close to the sewage treatment plant, we have to build longer and longer pipe networks to get that water to where it needs to go.
translation.zh: 因为一旦我们在污水处理厂附近 建起水循环系统， 我们就不得不建造越来越长的管网 把水送到需要的地方去。