英语改错（9处）Forests help to stop droughts and floors,because Chi

英语改错（9处）
Forests help to stop droughts and floors,because China
has built a new Great Wall through the northern part
of the country.The Great Wall is 7000 kilometre
long,between 400 and 1700 kilometers wide.It will
stop the wind of blowing the earth away.It will stop the
sand moving towards the poor farmland in the south.
If more Great Green Wall are built,and more good
lands will be protected and then more crops will be
produced to feed more people.So it's our duty to
stop cutting down some trees.