core of rope

例句：

1. 1. The core of the problem lies in this area.
   问题的核心在于这个地区。
2. 2. The company's core values are integrity and customer service.
   公司的核心竞争力是诚信和客户服务。
3. 3. The scientist found a new core to his theory.
   科学家发现了他的理论的新核心。