讽刺的是，关于这个主题的唯一一本好书已经绝版了。

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

无论如何，食品是一个大产业，也是我们文化的重要贡献者，但讽刺的是，食品也是世界上最大的问题。

Either way, food is a big industry and a vital contributor to our culture, but ___ironically, food is also the biggest problem in the world.

讽刺的是，安全检查员自己的家未能通过消防法规检查。

___Ironically, the safety inspector's own home failed the fire code inspection.