2 sentences

1. 书籍是人类进步的阶梯。

   shū​jí shì rén​lèi jìn​bù de jiē​tī.

   Books are the ladder of human progress.

   Source: Dong Chinese Dictionary

2. 他沿着陡峭的阶梯爬上了塔顶。

   tā yán​zhe dǒu​qiào de jiē​tī pá​shàng le tǎ​dǐng.

   He climbed the steep stairs to the top of the tower.

   Source: Dong Chinese Dictionary