开头：
When it comes to ..., some think ...
There is a public debate today that ...
A is a commen way of ..., but is it a wise one?
Recentaly the problem has been brought into focus.
提出观点：
Now there is a growing awareness that...
It is time we explore the truth of ...
Nowhere in history has the issue been more visible.
进一步提出观点：
... but that is only part of the history.
Another equally important aspect is ...
A is but one of the many effects. Another is ...
