回答： In Chinese history, Qin dynasty is one of the most renowned times without any doubts. The first emperor of Qin conquered other five countries and achieved his great ambition of unifying the mainland of China. He not only conquered in violence but also combined different types of cultures in China and firstly formed and established the unique official words and the currency in Chinese history. According to what listed above, the first emperor of Qin successfully set up the initial feudal empire of China, which is permanently recorded by later generations and prevalently admired by later emperors. Li Bing, one of the magistrates in Sichuan Province at that time, was also a talent hydraulician in charge of the Dujiang Weir Project. Without any modernized facilities and auto-machines, without any western science knowledge, he successfully built the weir and irrigation system at Dujiang area just depending on Chinese traditional engineering experiences and creative design process.

回答： The rulers' achievements at some certain cases build upon the sacrifice of the laboring people, which means that such success acts against the greatness of the country. The first emperor of Qin Dynasty was a man restrictive to his people, forcing the general to realize his own ambition of conquering the world. Though his military was impregnable at the very beginning of the time, the laboring mass of Qin continued to rally against the government and to conduct revolutions for human rights. The country where its people had no basic rights and lost essential sense of safety was not a place of absolute greatness.

回答： As to the cases like Dujiang Weir Project, the local citizens' living levels at that time were greatly improved than the situations before the civil war in China. And Sichuan has been recognized as one of Chinese most fertilized and affluent provinces since Qin Dynasty. Depending on such affluency, Sichuan was regarded as the special granary, where people cultivated foods and produced textile used for general living supply and military supply. And Qin Dynasty maintained its hegemony for nearly half a century.

回答： Compared with general welfare, the achievements of rulers and scientists not only prove the greatness of the country,but also reflect the limitations and irrationality of the time. Qin Dynasty is admired as the most invincible empire in Chinese history while also reputed as the cruelest and most ruthless one.Centralization, caught out by the emperor and achieved by ruthless methods, was focused on standardizing legal codes and bureaucratic procedures, the forms of writing and coinage, and the pattern of thought and scholarship.Millions of humans were forced to build up the Great Wall, the historic defending facility of China. There is an old-saying going like that the wall is lying just on the innumerous dead bodies who used to build it.

回答： People's essential sense of safety and happiness. People wealthy and live in harmony. People highly educated and have affluent cultures and technology.Show great achievements in art, literature, science.--> high spirit quality of life,more enjoyable life beyond the foundamental needs of surviving. Show high rate of developing and high speed productivity.--> high level of civilization--> greater possibility of high level material quality of life. The general welfare, in some extent, is able to reflect the affluency of the material quality of people's lives, but is not convictive as to the spirit fields, which is also a indispensable to senior society.