### 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: In the past century, the world's great changes and the global epidemic of the new coronavirus epidemic intertwined, the external environment became more complex and severe, and the domestic new coronavirus epidemic prevention and control and economic and social development tasks were extremely difficult.
### Errors: There is a major error at "century,". There is a major error at "world's great changes and the global epidemic of the new coronavirus epidemic intertwined". There is a major error at "domestic new coronavirus epidemic prevention and control and". There is a major error at "development".

### 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.