4 sentences

1. 这是一个历史性的时刻。

   zhè shì yī gè lì​shǐ​xìng de shí​kè.

   This is a historic moment.

   Source: Dong Chinese Dictionary

2. 这次历史性的会晤对两国关系意义重大。

   zhè cì lì​shǐ​xìng de huì​wù duì liǎng guó guān​xi yì​yì zhòng​dà.

   This historic meeting is of great significance for the relations between the two countries.

   Source: Dong Chinese Dictionary

3. 在重要的历史性关头，我们必须做出正确的决定。

   zài zhòng​yào de lì​shǐ​xìng guān​tóu, wǒ​men bì​xū zuò​chū zhèng​què de jué​dìng.

   At a critical historical juncture, we must make the right decision.

   Source: Dong Chinese Dictionary

4. 这张旧报纸上刊登了金正日当年访问莫斯科的历史性照片。

   zhè zhāng jiù bào​zhǐ shàng kān​dēng le Jīn Zhèng​rì dāng​nián fǎng​wèn Mò​sī​kē de lì​shǐ​xìng zhào​piàn.

   This old newspaper features a historic photograph of Kim Jong-il's visit to Moscow at that time.

   Source: Dong Chinese Dictionary