### 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 introduction from related responsible person of Bureau for Disease Control and Prevention of National Health Commission, for some port cities, cross-border trade is the main economic pillar, and citizens of both sides have frequent dealings.
### Errors: There is a minor error of incorrect translation has stylistic problems at "related responsible person". There is a minor error of incorrect translation is missing content from the correct translation at "Bureau for Disease Control and Prevention". There is a minor error of incorrect translation includes information not present in the correct translation at "dealings".

### 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.