讽刺的是，这个主题唯一的好书已经绝版了。

___Ironically, the only good book on this subject has gone out of print.

食物是我们文化的重要贡献者，但讽刺的是，它也是世界上最大的问题。

Food is a vital contributor to our culture, but ___ironically, it is also the biggest problem in the world.

他声称讨厌技术，但讽刺的是，他每天都使用智能手机。

He claimed to hate technology, yet ___ironically, he uses a smartphone every day.