what kind of solid wastes do you often see?where are they from?

We often see used plastic bags and broken glasses. They come from different people who use them and throw them.

你经常看见何种固体垃圾？它们来自哪里？

你经常会看到什么固体垃圾？他们的源头在那里？

glass,it comes from broken windows.

你常见的固体垃圾有哪些？它们都是如何产生的？

你经常看见什么固体垃圾(污染物)?它们来自那里?