9--翻译，真的谢谢啦

In a foreign country, someone has done an interesting experiment, take a lawn, grass has been divided into a few points to the shepherds, but in the middle left one as a public space, each one shepherd can be free to use. A result, sociologists have found that one year, is divided into the grass to individuals have been planned and used sparingly, but as a public space but because of overgrazing of grassland and barren. .Test was concluded that: Because each person has his living space and resources to expand outward nature, no one in the public interest in the management of state, each person will consciously or unconsciously, to extract public resources have been used by . Thus, in the unprotected state of the public interests are most vulnerable to abuse