3 sentences

1. 她在脸上涂了一层薄薄的白粉。

   tā zài liǎn shàng tú le yī céng báo​báo de bái​fěn.

   She applied a thin layer of white powder to her face.

   Source: Dong Chinese Dictionary

2. 他因为贩卖白粉被警方逮捕了。

   tā yīn​wèi fàn​mài bái​fěn bèi jǐng​fāng dài​bǔ le.

   He was arrested by the police for trafficking heroin.

   Source: Dong Chinese Dictionary

3. 黑板擦一拍，教室里到处都是白粉。

   hēi​bǎn cā yī pāi, jiào​shì lǐ dào​chù dōu shì bái​fěn.

   When the blackboard eraser was tapped, chalk dust went everywhere in the classroom.

   Source: Dong Chinese Dictionary