有三边的

例句：

1. 1.The trilateral agreement between the three countries is crucial for their economic development.
   这三个国家之间的三角协议对于他们的经济发展至关重要。
2. 2.The trilateral summit was held to discuss the issue of climate change.
   三边峰会召开是为了讨论气候变化问题。
3. 3. The trilateral trade agreement has been signed by all three countries.
   三国之间的贸易协定已经签署。