首

这首歌现在很流行。

Zhè shǒu gē xiànzài hěn liúxíng.

This song is very popular now.

首先要注意安全，其次要节约时间。

Shǒuxiān yào zhùyì ānquán, qícì yào jiéyuē shíjiān.

First pay attention to safety; secondly, save time.

这个城市是一个国家的首都。

Zhège chéngshì shì yì ge guójiā de shǒudū.

This city is the capital of a country.