After often years at sea, adult Atlantic salmon swim thousands of miles to return to the chalk streams where they were born.
全要素生产率提升，既是技术创新的表现，更是制度红利的释放。深化改革开放，从内部体制优化和外部资源引入双向赋能全要素生产率提升，畅通国民经济循环。
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Producer: Kate White, Katie Tomsett, Clare Salisbury and Alex Mansfield
友谊医院顺义院区外景。北京市发改委供图