key branches of the economy

例句：

1. 1. The key to solving the problem lies in finding a suitable solution.
   解决这个难题的关键是找到一个合适的解决方案。
2. 2.The success of the project depends on the quality of the work done by the team.
   项目的成败取决于团队完成的工作质量。
3. 3.The key to success is hard work and dedication.
   成功的关键是努力工作和奉献。