Obama also called climate change and nuclear proliferation”challenges that neither of our nations can solve by acting alone.” He said the two will continue to “build a positive, cooperative and comprehensive relationship.”
【正确答案】：奥巴马也把气候变化和核扩散称为“我们两国都无法单方面应对的挑战”。他说两国将继续“构建积极合作的全面伙伴关系”。
