4 sentences

1. 贪婪往往是犯罪的根源。

   tān​lán wǎng​wǎng shì fàn​zuì de gēn​yuán.

   Greed is often the root cause of crime.

   Source: Dong Chinese Dictionary

2. 想像力是一切文明的根源。

   xiǎng​xiàng​lì shì yī​qiè wén​míng de gēn​yuán.

   Imagination is the root of all civilization.

   Source: Tatoeba

3. 你应该追究这件事的根源。

   nǐ yīng​gāi zhuī​jiū zhèi jiàn shì de gēn​yuán.

   You should investigate the root cause of this matter.

   Source: Dong Chinese Dictionary

4. 这种思想有着深远的历史根源。

   zhè zhǒng sī​xiǎng yǒu zhe shēn​yuǎn de lì​shǐ gēn​yuán.

   This ideology has deep historical roots.

   Source: Dong Chinese Dictionary