### Chinese: 国家卫生健康委疾病预防控制局有关负责人介绍，对于一些口岸城市来说，跨境边贸是当地主要经济支柱，双方边民往来频繁。
### English: For some port cities, cross-border trade is the local major economic pillar, and frequent exchanges between border citizens between the two sides.
### Errors: There is a minor error of incorrect translation is missing content from the correct translation at "between the two sides". There is a minor error of problems with grammar, other than orthography at "For some port cities, cross-border trade is the local major economic pillar,".

### Improved English: According to the introduction of the person in charge of the Bureau of Disease Prevention and Control of the National Health Commission, for some port cities, cross-border trade is the main local economic pillar and the border residents from both sides have frequent exchanges.