frontier traffic

例句：

1. 1. The frontier traffic between the two countries is always busy during peak seasons.
   两国之间的边境交通在旺季总是非常繁忙。
2. 2.The border crossing traffic has been reduced due to stricter security measures.
   由于严格的安全措施，边境过境交通已经减少。
3. 3. The frontier traffic between China and India is a major concern for both countries.
   中国和印度之间的边境交通是两国都非常重视的问题。