4 sentences

1. 农夫拉着碌碡在麦场上碾麦子。

   nóng​fū lā zhe liù​zhou zài mài​cháng shàng niǎn mài​zi.

   The farmer pulled a stone roller to thresh wheat on the threshing floor.

   Source: Dong Chinese Dictionary

2. 他们正在场院里碾谷子，准备过冬的粮食。

   tā​men zhèng​zài cháng​yuàn lǐ niǎn gǔ​zi, zhǔn​bèi guò​dōng de liáng​shi.

   They are threshing grain in the courtyard to prepare food for the winter.

   Source: Dong Chinese Dictionary

3. 医生把药片碾成粉末喂给孩子吃。

   yī​shēng bǎ yào​piàn niǎn chéng fěn​mò wèi gěi hái​zi chī.

   The doctor crushed the tablet into powder to give to the child.

   Source: Dong Chinese Dictionary

4. 那个沉重的碾是由整块花岗岩凿成的。

   nà gè chén​zhòng de niǎn shì yóu zhěng kuài huā​gāng​yán záo​chéng de.

   That heavy stone roller was carved from a single block of granite.

   Source: Dong Chinese Dictionary