3 sentences

1. 玫瑰花的茎上长着锋利的刺。

   méi​guī​huā de jīng shàng zhǎng zhe fēng​lì de cì.

   There are sharp thorns on the stems of roses.

   Source: Dong Chinese Dictionary

2. 这种植物的茎部含有发达的髓。

   zhè zhǒng zhí​wù de jīng bù hán​yǒu fā​dá de suǐ.

   The stem of this plant contains a well-developed pith.

   Source: Dong Chinese Dictionary

3. 这种植物的茎上带刺，摘的时候要小心。

   zhè zhǒng zhí​wù de jīng shàng dài​cì, zhāi de shí​hou yào xiǎo​xīn.

   The stem of this plant has thorns, so be careful when picking it.

   Source: Dong Chinese Dictionary