他花了十年时间写一本关于如何成功的书，结果却破产了，真是讽刺。

The ___irony was that he spent 10 years writing a book about success, only to go bankrupt.

他明知我讨厌下雨，却故意说‘今天天气真好’，真是讽刺。

Knowing I hate rain, he said with ___irony, 'What a beautiful day it is today!'