lock and key theory

例句：

1. 1. The lock and key theory suggests that the best way to solve problems is to find the right combination of solutions.
   锁与钥匙理论认为，解决最佳问题是找到正确的解决方案组合。
2. 2. In this theory, the key to success lies in finding the balance between effort and reward.
   在这个理论中，成功的关键在于努力和奖励之间的平衡。
3. 3. The theory holds that if you have the right combination of skills and resources, you can overcome any obstacle.
   这一理论认为，如果你拥有合适的技能和资源组合，你就能克服任何障碍。