### Chinese: 一年来，世界百年未有之大变局和新冠肺炎疫情全球大流行交织影响，外部环境更趋复杂严峻，国内新冠肺炎疫情防控和经济社会发展各项任务极为繁重艰巨。
### English: Over the past year, major changes that have not occurred in the world in 100 years and the COVID-19 pandemic have intertwined. The external environment has become more complex and severe. The tasks of COVID-19 prevention and control and economic and social development in China are extremely onerous and arduous.
### Errors: There is a major error of incorrect translation is missing content from the correct translation at "in China". There is a major error of incorrect translation includes information not present in the correct translation at "100 years".

### Improved English: For the past year, under the intertwined influences of the great changes never seen during the past one hundred years and the COVID-19 global pandemic, external environments were more complicated and grim, and the tasks of pandemic prevention and control and various economic and social development tasks are extremely heavy and arduous.