Kerry says that the United States and China should maintain constructive engagement and jointly address global challenges.

克里表示，美国和中国应该保持建设性的接触，共同应对全球挑战。

This past summer, our people chose constructive engagement through the ballot box, and through this, they gave the world a historic opportunity to change course.

在今年夏天，我们的人民通过投票选举了建设性的接触，也因此给了全世界历史性的机会来改变进程。

President Hassan Rouhani said that the agreement proved that constructive engagement worked. Both Iran and the United States say the deal is a historical opportunity. Bethany Bell reports.

总统哈桑·鲁哈尼(Hassan Rouhani)表示，该协议证明建设性接触是奏效的。伊朗和美国都表示，该协议是一个历史性的机会。Bethany Bell报道。