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.”）

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.”）

他说两国将继续“构建积极合作的全面伙伴关系”。