3 sentences

1. 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

2. 这根牛大骨里有很多髓，吃起来非常香。

   zhè gēn niú dà gǔ lǐ yǒu hěn​duō suǐ, chī qi​lai fēi​cháng xiāng.

   This large beef bone has a lot of marrow, which tastes delicious.

   Source: Dong Chinese Dictionary

3. 他在老师的指导下，终于领悟到了这门手艺的髓。

   tā zài lǎo​shī de zhǐ​dǎo xià, zhōng​yú lǐng​wù dào le zhè mén shǒu​yì de suǐ.

   Under his teacher's guidance, he finally grasped the essence of this craft.

   Source: Dong Chinese Dictionary