The passage tells us that destoried by people,80 persents of The Great Wall which was built and rebulit by lots of dynasties in the past 2000 years is in danger and call on us to protect it.
这句太长了,看着烦,切成小句更上口.
lead to our attention.改为arouse our attention.【lead to 为导致坏结果】
benefical 拼写错误beneficial