3 sentences

1. 这份正式文件上盖有国玺。

   zhè fèn zhèng​shì wén​jiàn shàng gài yǒu guó​xǐ.

   This official document is stamped with the national seal.

   Source: Dong Chinese Dictionary

2. 皇帝在诏书上盖上了玉玺。

   huáng​dì zài zhào​shū shàng gài​shàng le yù​xǐ.

   The emperor pressed the imperial jade seal onto the edict.

   Source: Dong Chinese Dictionary

3. 传国玉玺被视为象征最高皇权的神器。

   chuán​guó yù​xǐ bèi shì​wéi xiàng​zhēng zuì gāo huáng​quán de shén​qì.

   The Heirloom Seal of the Realm is regarded as a divine vessel symbolizing the highest imperial power.

   Source: Dong Chinese Dictionary