这个花园的设计方案里，喷泉是后来才想到加上去的。

The fountain was included in the garden design as an ___afterthought.

他在邮件末尾补充了一句，说周五可以见面，这看起来像是事后想起的。

He added at the end of the email that he could meet on Friday, which seemed like an ___afterthought.