Over the past 25 years, China has been committed to reform and opening-up. As a result, we established a socialist market economy. We built an open economy. We improved productivity and overall national strength. We made all-around progress in social undertakings. Our people leapfrogged from a sufficient life to a moderately prosperous one.
致力于：be committed to (doing) sth.
leapfrog: 蛙跳；飞跃；跨越（障碍） // 技术飞跃：a technological leapfrog
Over the past 25 years, China has been unswervingly carrying out reform and opening up, building a socialist market economic system, establishing an open economy, strengthening social productivity and overall national power, improving various social programs, and made a historic leapfrog that transform people's life from a life that people barely had enough to eat and wear to a life that is moderately prosperous.