4 sentences

1. 她紧锁着眉头，陷入了沉思。

   tā jǐn​suǒ zhe méi​tóu, xiàn​rù le chén​sī.

   She knitted her brows and fell into deep thought.

   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

3. 看到孩子平安回来，她的眉头终于舒展了。

   kàn​dào hái​zi píng'ān huí​lai, tā de méi​tóu zhōng​yú shū​zhǎn le.

   Seeing her child return safely, her furrowed brow finally relaxed.

   Source: Dong Chinese Dictionary

4. 看到孩子平安归来，他紧锁的眉头终于舒开了。

   kàn​dào hái​zi píng'ān guī​lái, tā jǐn​suǒ de méi​tóu zhōng​yú shū kāi le.

   Seeing his child return home safely, his furrowed brow finally relaxed.

   Source: Dong Chinese Dictionary