translation.en: And it was an environmental improvement, because, for instance, in 1903 they outlawed horses and buggies in downtown Manhattan, because you can imagine what the roads look like when you have a million horses, and a million of them urinating and doing other things, and the typhoid and other problems created were almost unimaginable.
translation.zh: 它还改善了环境卫生，因为 在1903年曼哈顿的城区已经禁行马车了， 你可以想像那些马路的模样 当路上有很多马 而且他们都在撒尿或干别的 会酿成无数伤寒症，还有别的问题