2 sentences

1. 他在书眉上写下了几行批注。

   tā zài shū méi shàng xiě​xià le jǐ háng pī​zhù.

   He wrote a few lines of annotations in the margins of the book.

   Source: Dong Chinese Dictionary

2. 他紧锁双眉，似乎在思考什么难题。

   tā jǐn​suǒ shuāng méi, sì​hū zài sī​kǎo shén​me nán​tí.

   He knitted his brows, appearing to be thinking about a difficult problem.

   Source: Dong Chinese Dictionary