1 sentence

1. 工业废水是造成水污染的主要原因之一。

   gōng​yè fèi​shuǐ shì zào​chéng shuǐ​wū​rǎn de zhǔ​yào yuán​yīn zhī​yī.

   Industrial wastewater is one of the main causes of water pollution.

   Source: Dong Chinese Dictionary