可以这样开头：
There has been a casted shadow on the Chinese public by the past drastic earthquakes in
Wenchuan,Sichuan Province and Yushu,a county in Qinghai Province.Regarding the rescure
process,admittedly there is improvement compared to the Wenchuan earthquake in 2008;
however,there is room for a further step forward.
In order to prepare the public to deal with teh disasters better,we should first of all
make sure that people are aware of the basic techniques essential for self-protection and
rescuring.For example,the buddy system is crucial in emergencies like earthquake.
However,a praise-worth example on this is from the Sangzao high school in Anxian county during
the Wenchuan earthquake.The principal in that school was aware of the condemned building
when he took over the school,therefore regular measures were taken to reinforce the building
and students are trained how to face emergency.It is rewarding because when the earthquake struck
Wenchuan,none of the student got injured.It strongly indicates how important well-preparedness
can save lives.
.
But,+陈述反例,说明以上只是极个别的；以证明nation is unprepared
for disaster.