本体的

例句：

1. 1. The main purpose of the meeting was to discuss the budget.
   会议的主要目的是讨论预算。
2. 2. The principal of the school is to educate students well.
   学校的校长职责是教育学生。
3. 3. The main focus of the research was on the effectiveness of the new technology.
   研究的重点是新技术的有效性。