It was the bitterest reproach he had made.

这是他的最苛刻的责备了。

Thee bee sucks honey out of the bitterest flowers.

蜜蜂是从最苦的花朵中吸取花蜜。

I must seek Salvation from my bitterest friend, my Dearest enemy.

我必须从最亲密的敌人（亦是刻薄的朋友）那里寻求帮助。

Yale, Harvard's bitterest rival, revealed its plans on January 14th.

耶鲁这个在哈佛后面最苦苦相随的竞争对手，于今年1月14日推出了自己的计划。