core of paste

例句：

1. 1.The core of the cake is made fromthe center of the cake.
   蛋糕的核心是由蛋糕中心的。
2. 2. The core of the problem lies inunderstanding its root causes.
   问题的核心在于理解其根本原因。
3. 3. The core of the company's strategy is to focus on innovation.
   公司战略的核心是专注于创新。