4 sentences

1. 张骞出使西域，开辟了丝绸之路。

   Zhāng Qiān chū​shǐ Xī​yù, kāi​pì le Sī​chóu​zhī Lù.

   Zhang Qian went to the Western Regions as an envoy and opened up the Silk Road.

   Source: Dong Chinese Dictionary

2. 安息帝国曾是丝绸之路上的一个重要国家。

   ān​xī dì​guó céng shì Sī​chóu​zhī Lù shàng de yī gè zhòng​yào guó​jiā.

   The Parthian Empire was once an important country on the Silk Road.

   Source: Dong Chinese Dictionary

3. 他打算暑假去河西地区考察古丝绸之路的历史遗迹。

   tā dǎ​suàn shǔ​jià qù Hé​xī dì​qū kǎo​chá gǔ Sī​chóu​zhī Lù de lì​shǐ yí​jì.

   He plans to go to the Hexi region during the summer vacation to investigate the historical relics of the ancient Silk Road.

   Source: Dong Chinese Dictionary

4. 丝绸之路上商贾往来不断，极大促进了东西方的贸易交流。

   Sī​chóu​zhī Lù shàng shāng​gǔ wǎng​lái bù​duàn, jí dà cù​jìn le dōng​xī​fāng de mào​yì jiāo​liú.

   The constant stream of merchants along the Silk Road greatly promoted trade and exchange between the East and the West.

   Source: Dong Chinese Dictionary