4 sentences

1. 河流是最先的道路。

   hé​liú shì zuì​xiān de dào​lù.

   Rivers were the first roads.

   Source: CCMatrix

2. 我是最先发言的人之一。

   wǒ shì zuì​xiān fā yán de rén zhī​yī.

   I was one of the first to speak.

   Source: CCMatrix

3. 金子大概是人类最先使用的金属。

   jīn​zi dà​gài shì rén​lèi zuì​xiān shǐ​yòng de jīn​shǔ.

   Gold was probably the first metal used by humans.

   Source: CCMatrix

4. 一旦决定辞职，你最先应该告诉的人就是你的领导。

   yī​dàn jué​dìng cí zhí, nǐ zuì​xiān yīng​gāi gào​sù de rén jiù​shì nǐ de lǐng​dǎo.

   Once you’ve decided to resign, the first person you should tell is your manager.

   Source: CCMatrix