### Chinese: 尽管德尔塔仍然是全世界主要的新冠病毒株，但奥密克戎病例正在数十个国家出现，其中南非为疫情中心。
### English: Although Delta is still the main new crown virus strain in the world, Omicron cases are emerging in dozens of countries, of which South Africa is the center of the epidemic.
### Errors: There is a major error of terminology is non-standard or does not fit context. terminology is used inconsistently at "new crown virus strain". There is a minor error of incorrect translation includes information not present in the correct translation at "of which".

### Improved English: Although Delta is still the main COVID-19 virus strain of the world, Omicron cases are emerging in dozens of countries with South Africa at the center of the epidemic.