Man is faced with more and more problems which threaten man's existence on Earth.The resources will soon be exhausted. Many diseases can't be cured. And the problems of pollution and population are also getting worse according to some studies.
人類正面臨著越來越多的問題,這些問題威脅著人類的生存。資源將很快被用完,許多疾病還不能治愈,研究表明,污染問題和人口問題正在變得越來越嚴重。