The scientists in China worked on creating better ways to grow crops in hilly areas to make more money and protect the environment. They looked at different ways to plant crops and found that a new method with three kinds of plants increased profits by a lot. This new way of planting crops used more energy and work from farmers, but it helped to produce more food. The study showed that this new system is a good way to make more money from farming and use fewer natural resources in the long run. Overall, the new way of planting crops in hilly regions can increase profits and help protect the environment.