Word: 偶然 (ǒurán)

我上个星期在聚会上偶然遇见了他。

Wǒ shànggexīngqī zài jùhuì shàng ǒurán yùjiànle tā.

I bumped into him at a party last week.

我们偶然乘上了同一辆列车。

Wǒmen ǒurán chéng shàng le tóngyī liàng lièchē.

We happened to be on the same train.

我偶然发现了那本书。

Wǒ ǒurán fāxiànle nà běn shū.

I found the book by accident.

我偶然找到了它。

Wǒ ǒurán zhǎodàole tā.

I found it by chance.

我觉得这种事情偶然发生。

Wǒ juéde zhèzhǒng shìqing ǒurán fāshēng.

I think that things like this happen by chance.

那场战争并不是偶然发生的。

Nà chǎng zhànzhēng bìng bú shì ǒurán fāshēng de.

The war didn't break out by accident.