epistle

这位哲学家写了一封长信给他的学生，阐述了他对生命意义的深刻见解。

The philosopher wrote a lengthy ___epistle to his disciple, expounding his profound insights on the meaning of life.

那位中世纪国王写给邻国君主的封蜡书信提议以双方长子女的联姻来结成军事同盟。

The medieval king's sealed ___epistle to the neighboring monarch proposed a military alliance bound by the marriage of their eldest children.

在动身前往新大陆的前夜，那位年轻水手在厨房擦得发亮的木桌上给母亲留下一封沾着泪痕的长信。

On the eve of his departure for the New World, the young sailor left a tear-stained ___epistle for his mother on the scrubbed wooden kitchen table.