and to improve the building of the party as it leads contemporary china in development and progress preserve and enhance its vanguard nature and ensure that it is always in the forefront of the times
坚持在引领当代中国发展进步中完善党的建设，保持和增强党的先锋性，始终走在时代前列
以上为机器翻译结果，长、整句建议使用 人工翻译 。