Her brow furrowed in concentration.

她眉头紧锁全神贯注。

《牛津词典》

Yet her brow furrowed as she considered the matter.

然而，她眉头皱起来，认真地思考着这个问题。

youdao

For facing life with arms crossed, brow furrowed, and expectation as a rule is, without question, a waste.

因为如果抱着手、皱着眉地对待生活，那么所有的期望都会化为泡影。

youdao

With his brow furrowed and jaw set, he looked out at the crowd and started his speech.

FORBES: Connect

The grandmother's brow furrowed, and she seemed stricken by how unfair it all was, but then she and the little girl said good-bye and veered off into the subway crush.

CNN: Stranger's unexpected generosity makes a big impression

Obama watched his opponent speak attentively, whether smiling or nodding with furrowed brow, as McCain criticized him.

NPR: The Hatchet And The Scalpel: A Debate Parable