求翻译：在过去 城市里都是一些旧房子 现在被高楼大厦取代了 从前有很多坑坑洼洼的小路 也被一些高速公路取代了 过去 河水污浊 现在 河水清澈了 从前的人们工作是步行和骑自行车 现在他们上班都做公交车和小汽车去 过去人们的生活条件很差 居住在黑暗 矮小的房子里 现在他们都住在高楼大厦里 生活条件也好了许多是什么意思？

In the past some of the old city are replaced by high-rise buildings now house a lot of bumpy path past have been replaced some of the highway past the dirty river water is now clear to the past work of people walking and cycling to work now they have to do bus trucks and cars to go past the living

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All was some old houses is substituted now in the past city by the tall buildings Formerly had very many bumpy alleys also to substitute by some highways In the past the river water filthy present river water limpid past people have worked are the walk and ride the bicycle they to go to work now all

In past city in are is some old House now was high-rise buildings replaced has once upon a has many be pitted with holes of path also was some Expressway replaced has past River foul now River clear has once upon a of people work is walk and riding bike now they work are do bus and car to past peopl

All was some old houses is substituted now in the past city by the tall buildings Formerly had very many bumpy alleys also to substitute by some highways In the past the river water filthy present river water limpid past people have worked are the walk and ride the bicycle they to go to work now all