central cross-section

例句：

1. 1. The city is located at thecenter of the country.
   这个城市位于国家的中心。
2. 2. The project is central to our strategy.
   这个项目是我们战略的核心。
3. 3. The meeting was heldin the center of the room.
   会议在房间的中心举行。