theory of comparative productivity

例句：

1. 1. The theoryof comparative productivity has been a subject ofmuch debate in the field of economics.
   比较生产力理论一直是经济学领域内争论的焦点。
2. 2. This research aims to develop a moreeffective theory of comparative productivity for sustainable development.
   这项研究旨在为可持续发展制定一个更有效的比较生产力理论。
3. 3. The theory of comparative productivityis crucial for understanding how different countries canimprove their productivity levels.
   比较生产力理论对于理解不同国家如何提高生产力水平至关重要。