phren-

例句：

1. 1.The scientist was studying the structure of the human brain.
   这位科学家正在研究人类大脑的结构。
2. 2.He had a phren in his forehead that made him look like he was always angry.
   他的额头上有一块胎记，让他看起来总是很生气。
3. 3. She was worried about her phren being visible to others.
   她担心她的颅骨会被其他人看到。