Obama also called climate change and nuclear proliferation”chall

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”。