### 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: According to the relevant person in charge of the Bureau of Disease Prevention and Control of the National Health Commission, for some port cities, cross-border border trade is the main pillar of the local economy, and border people from both sides have frequent exchanges.
### Errors: There is a minor error of word choice at "cross-border border trade".

### 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.