AI138集思广益中参加讨论提高自己惠及他人

ruiheh

We can only realize the value of historical sites and national park if the site is not destroyed. Give example of destroyed sites

How can nature be natural if access is not restricted? The consequences of allowing unrestricted accesses to these valuable sites is immeasurable. People can ... < give extreme cases >

Because they - national parks and historical sites - belongs to everyone, protections are needed. Else, some people may take advantage of the less / non-restrictive site and exploit the sites for their own gains. Give examples...