4 sentences

1. 他写下了这封遗书，与家人长诀。

   tā xiě​xià le zhè fēng yí​shū, yǔ jiā​rén cháng​jué.

   He wrote this final letter to bid a permanent farewell to his family.

   Source: Dong Chinese Dictionary

2. 警察在死者的书桌上发现了一封简短的遗书。

   jǐng​chá zài sǐ​zhě de shū​zhuō shàng fā​xiàn le yī fēng jiǎn​duǎn de yí​shū.

   The police found a short suicide note on the deceased person's desk.

   Source: Dong Chinese Dictionary

3. 专家们正在研究这些从古墓中出土的遗书。

   zhuān​jiā men zhèng​zài yán​jiū zhè​xiē cóng gǔ mù zhōng chū​tǔ de yí​shū.

   Experts are studying these ancient manuscripts unearthed from the tomb.

   Source: Dong Chinese Dictionary

4. 这些散文和诗稿是那位著名作家留下的遗书。

   zhè​xiē sǎn​wén hé shī​gǎo shì nà wèi zhù​míng zuò​jiā liú​xià de yí​shū.

   These essays and poem drafts are posthumous works left by that famous writer.

   Source: Dong Chinese Dictionary