trash disposal: 垃圾处理
advocate: v. 提倡，鼓吹
frugal: adj. 节俭的，朴素的
scale: n. 规模，范围
万能句型：
However...is not ... but is..., as a matter of fact, ...
Quite the contrary...
The picture purposefully points out...
The past century has witnessed an unPcedented increase in...
Only through ... trash disposal can this problem be fully solved.
Moreover, we should advocate...
