Half her brain, yes. 一半的大脑 是的

470. of her brain be removed and sealed off.
     所有病变组织
471. See, eventually, the spinal fluid will fill the cavity.
     最后 脊髓液会填满空腔
472. Remove? But, I mean, that's--
     所有部分 那不就是
473. Half her brain, yes.
     一半的大脑 是的
474. Half her brain-- that... seems impossible.
     半个大脑 这怎么可能
475. Her age makes it possible.
     好在她现在还小
476. Her brain's not fully developed,
     脑部还未完全发育成熟

来自《实习医生格蕾 第一季 第七集 Grey's Anatomy S01E07》第 473 行