ADJ [ADJ n]（谈判、会议、协议等）双边的Bilateral negotiations, meetings, or agreements, involve only the two groups or countries that are directly concerned. （谈判、会议、协议等）双边的 [formal]
...bilateral talks between Britain and America.
英国和美国之间的双边会谈
bilaterally
Disputes and differences between the two neighbours would be solved bilaterally.