她眉头紧锁，看起来很焦虑。

Her ___brow is furrowed; she looks anxious.

她皱起眉头，显得很困惑。

She furrowed her ___brow in confusion.

站在悬崖的边缘，他感到一阵眩晕。

Standing at the ___brow of the cliff, he felt a sudden dizziness.