We must do everything in our power to ensure the success of the conference.我们必须尽一切能力保证会议圆满成功。The event was a great success, and I would like to thank everyone who took part.这次活动取得了圆满成功，我要感谢所有的参与者。The summit was crowned by the signing of the historic START treaty.此次峰会以签订具有历史性意义的《削减进攻性战略武器条约》宣告圆满成功。