limit of backwater

例句：

1. 1.The backwater of the city is full of trash and pollution.
   城市的后水区充满了垃圾和污染。
2. 2. He was stuck in the backwater of his career for too long.
   他在他的职业生涯中停滞不前太久了。
3. 3.The backwater of the river was so polluted that it had to be drained.
   这条河的后水区域被污染得如此严重，以至于不得不排干。