/ˈfrʌntɪər ˈtræfɪk/ – Phrase
Definition: buôn bán trên biên giới, mậu dịch biên giới.
A more thorough explanation: Frontier traffic refers to the transportation of goods, people, or vehicles across a border between two countries or regions. This term is often used in legal contexts to describe the movement of goods or individuals across international or regional boundaries.
Example: The frontier traffic between the two countries has increased significantly in recent years, leading to the need for improved border security measures.