2 sentences

1. 他皱起了眉毛，显得很困惑。

   tā zhòu​qǐ le méi​mao, xiǎn​de hěn kùn​huò.

   He frowned, looking very puzzled.

   Source: Dong Chinese Dictionary

2. 他一看到这个难题就皱起了眉头。

   tā yī kàn​dào zhè​gè nán​tí jiù zhòu​qǐ le méi​tóu.

   He frowned as soon as he saw this difficult problem.

   Source: Dong Chinese Dictionary