### Chinese: 他说，与之相比，在上一波的德尔塔疫情中，他治疗的新冠患者“呼吸困难，血氧水平低。
### English: He said that in contrast, in the last wave of delta epidemic, the patients he treated with covid-19 had "dyspnea and low blood oxygen levels.
### Errors: There is a minor error at "delta epidemic". There is a minor error at "covid-19". There is a minor error at ""dys".

### Improved English: He said that, in comparison, the COVID-19 patients he treated in the last round of epidemic suffered from “breathing difficulties and low blood oxygen.