### 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: For the past year, with the complicated influences by the great changes never occurred during the past one hundred years and the pandemic COVID-19 conditions all over the whole world, there have been more complicated and severe external environments; there have been extremely heavy and arduous tasks at home including epidemic prevention and control as well as various economic and social development tasks.
### Errors: There is a major error of incorrect translation includes information not present in the correct translation at "at home". There is a major error of incorrect translation has stylistic problems at "there have been more complicated and severe external environments". There is a major error of incorrect translation is missing content from the correct translation at "the pandemic COVID-19 conditions all over the whole world".

### 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.