芝加哥位于中西部地区的中心。

Chicago is in ___the ___heart ___of the Midwest.

技术是现代教育的核心。

Technology is at ___the ___heart ___of modern education.

公园位于社区的中心，并且有一个游乐场。

The park is in ___the ___heart ___of the neighborhood, and it has a playground.