论文部分内容阅读
随着新世纪的开始,全球发展和人口增长必然会对地球的可居住性发出挑战。尤其是,人们愈来愈迫切地意识到,必须以保护环境
With the beginning of the new century, global development and population growth are bound to challenge the viability of the Earth. In particular, people are increasingly aware of the need to protect the environment