肇因

yī gēn luàn rēng de yān tóu bèi kàn zuò shì zhè chǎng huǒ zāi de zhào yīn

一根乱扔的烟头被看作是这场火灾的肇因。

A dropped cigarette is being blamed for the fire.

yōu yù zhèng de zhào yīn yīn rén ér yì ér qiě shí fēn fù zá

忧郁症的肇因因人而异，而且十分复杂。

The causes of depression are unique to each individual and very complex.