用英语翻译“我们都知道城市垃圾的危害有的两大方面：一是污染环境；二是有害健康。”

As we Know, The major harm of urban waste (gabage) is focus on two side : first of all , It is environment pollution, another is harmful to health.

"We all know the hazards of urban garbage and some are two key aspects: First, the pollution of the environment; second is harmful to health."

We know that municipal wastes have two kinds of harms, one is environment pollution, another is harmful to health.

"We all know that harm the city garbage has two aspects: one is the pollution of the environment; two is harmful to health."

We all know the harm of urban garbage has two things:One is pollute the environment, on the other hand is harmful to your health.