Obama also called climate change and nuclear proliferation &quot

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】：他说两国将继续“构建积极合作的全面伙伴关系”。
【题目解析】：代词two在原句中指的是两个国家，在翻译时应该明确地翻译出来。