### Chinese: 南非许多医生和医疗专家认为，新冠病毒奥密克戎变种所致病症比德尔塔变种更为轻微，虽然传播速度更快。
### English: Many doctors and medical experts in South Africa believe that the illness caused by the Omicron variant of the new crown virus is milder than the Delta variant, although it spreads faster.
### Errors: There is a minor error at "new crown". There is a minor error at "Delta".

### Improved English: Many doctors and medical experts in South Africa believe that patients infected by Omicron are milder cases compared with those infected by Delta, although Omicron is more transmissible.