noun · a letter or document written before death, such as a will or suicide note

警察在死者的书桌上发现了一封简短的遗书。

noun · historical books or documents passed down from ancient times

专家们正在研究这些从古墓中出土的遗书。

noun · literary works or manuscripts left behind by a deceased person

这些散文和诗稿是那位著名作家留下的遗书。