今年三月间，华盛顿与河内签署了越战以来第一份协议，双方将合作研究落叶剂造成的影响。

今年三月间，华盛顿与河内签署了越战以来第一份协议，双方将合作研究落叶剂造成的影响。的英文翻译

基本释义

• In March this year, Washington and Hanoi signed their first agreement since the Vietnamese war. The two sides will carry out cooperation on the research of the effects of leaf-falling agents.