encroach on standars of pollution control

例句：

1. 1. The developers encroached upon the natural park for commercial development.
   开发商为了商业开发而侵占了自然公园。
2. 2.The government is encroaching upon citizens' rights.
   政府正在侵犯公民的权利。
3. 3.The city was encroached upon by a flood.
   城市被洪水侵占。