central product

例句：

1. 1.The city is located at the heart of the country.
   这个城市位于国家的中心。
2. 2. The project is crucial to our company's success.
   这个项目对我们公司的成功至关重要。
3. 3. The meeting was held in the center of the room.
   会议在房间的中心举行。