• to uphold and improve the socialist system with Chinese characteristics and modernize the state system and capacity for governance
•to uphold and improve the Chinese socialist system and modernize the state governance system and capacity
• to uphold and improve Chinese socialism and modernize the state governance system and capacity
译文：The plenary session has defined a comprehensive plan and set clear requirements for upholding and improving the Chinese socialist system and modernizing the state governance system and capacity. We must make sound plans for both short-term and long-term goals, and ensure well-organized and coordinated implementation of all the tasks set out at the plenary session. (from the speech at the second full assembly of the Fourth Plenary Session of the 19th CPC Central Committee, October 31, 2019)
the fundamental, basic and important systems of Chinese socialism
译文：The fundamental, basic and important systems of Chinese socialism are the institutional frameworks for various undertakings of the Party and the state. (from the speech at the second full assembly of the Fourth Plenary Session of the 19th CPC Central Committee, October 31, 2019)
to ensure that our systems become more mature and better-defined
译文：When we plan to further reform in the new era, we must focus on upholding and improving Chinese socialism and modernizing the state governance system and capacity, with a deep understanding of the requirements for further development and the trends of the times. To achieve this, we will continue to reform systems and mechanisms in all sectors and areas, and ensure that our systems become more mature and better-defined. (from the speech at the Fourth Plenary Session of the 19th CPC Central Committee, October 28, 2019)
Upholding and improving the socialist system with Chinese characteristics and modernizing the state governance system and capacity is a major issue that impacts on the full development of the undertakings of our Party and state, the long-term stability of the country, and the happiness and wellbeing of the people.
In summary, guided by Marxism, the Chinese socialist system and state governance system have developed from the real conditions and culture of China, and they enjoy the full support of the people. They represent the most fundamental achievement of the Party and the people through lengthy struggle and strenuous effort. We must treasure them, uphold them with determination, and keep them up to date.
I have often said that only the wearer of the shoes knows if they fit or not. The Chinese people know best whether the Chinese socialist system suits the country or not.
"A state system must be established when founding a country."