地理作業-翻譯2(一段)1-5.3.5

In the United States and most other affluent countries, the air is cleaner, drinking water is purer, and most rivers and lakes are cleaner than they were in the 1970s. in addition, the food supply is more abundant and safer and the incidence of life-threatening infectious diseases has been greatly reduced.
在美國和其他大多數富裕的國家，空氣清潔，飲用水是純淨，並且大多數河流和湖泊比在上世紀70年代乾淨。另外，食品供應更加豐富，更安全和發生危及生命的傳染病，也大為減少。