bilateral aid

例句：

1. 1. The agreement is bilateral, meaning it involves two parties.
   该协议是双边的，意味着它涉及两个方。
2. 2.They reached a bilateral agreement on the trade issues.
   他们就贸易问题达成了双边协议。
3. 3.The bilateral relationship between the two countries has been strained over the past few years.
   两国之间的双边关系在过去几年里已经紧张。