### Chinese: 这3人都是学生，本月初从国外旅行回来，由于均为轻症，并未入院治疗。
### English: All three were students. They returned from a trip abroad earlier this month and were not admitted to hospital for treatment because they were all mild illnesses.
### Errors: There is a major error of incorrect translation is missing content from the correct translation at "All three were students.". There is a minor error of incorrect translation has stylistic problems at "earlier this month".

### Improved English: All of the 3 infected people were students who came back after traveling in other countries at the beginning of this month; all of them were not hospitalized because they were mild cases.