是brain:

She died of a brain tumour.

她死于脑瘤。

Alcohol acts quickly on the brain.

酒精对大脑迅速产生影响。

Her father died of a brain tumour.

他的父亲死于脑瘤。

They removed a clot from his brain.

他们从他的大脑里取出了血块。

A brain scan revealed the blood clot.

脑部扫描检查发现了那个血块。