3 sentences

1. 脊令是《诗经》中提到的鸟类。

   jǐ líng shì《 Shī​jīng》 zhōng tí​dào de niǎo​lèi.

   The wagtail is a bird mentioned in the Classic of Poetry.

   Source: Dong Chinese Dictionary

2. 这条鱼的脊上有一排锋利的鳍。

   zhè tiáo yú de jǐ shàng yǒu yī pái fēng​lì de qí.

   This fish has a row of sharp fins along its spine.

   Source: Dong Chinese Dictionary

3. 即使再苦再累，他依然挺直了脊。

   jí​shǐ zài kǔ zài lèi, tā yī​rán tǐng​zhí le jǐ.

   No matter how hard or tired he was, he still kept his back straight.

   Source: Dong Chinese Dictionary