ultimate cause

例句：

1. 1. The accident was caused by a malfunctioning brake system.
   这次事故是由于刹车系统失灵引起的。
2. 2.The decision to close the factory was driven by economic factors.
   决定关闭工厂的经济因素是主导的。
3. 3.The success of the project is attributed to effective communication and collaboration.
   项目的成功归功于有效的沟通和协作。