The bitterest thing in our today 's sorrow is the memory of our yesterday 's joy .

我们今天的悲哀里最苦的东西，是我们昨天的欢乐的回忆。

They are especially in the bitterest or happiest days .

尤其是最痛苦或快乐的日子。

He was one of his bitterest foes .

他是他一个不共戴天的仇敌。

The bitterest tears shed over graves are for words left unsaid and deeds left undone .

洒在坟墓最苦涩的眼泪是为了未说的话和未做的事。

The bitterest tear shed over graves are for words left unsaid and deeds left undone .

从坟墓里流出的最痛苦的泪水，是为了还没说出的话，和还未做过的事。