4 sentences

1. 我做了两次脑部手术。

   wǒ zuò le liǎng cì nǎo​bù shǒu​shù.

   I had two brain surgeries.

   Source: OpenSubtitles

2. 做些能刺激脑部的事情。

   zuò xiē néng cì​jī nǎo​bù de shì​qing.

   Do something that stimulates your brain.

   Source: CCMatrix

3. 他被火速送往医院做脑部扫描。

   tā bèi huǒ​sù sòng wǎng yī​yuàn zuò nǎo​bù sǎo​miáo.

   He was rushed to hospital for a brain scan.

   Source: AI Challenger 2017

4. 痴呆症是一种复杂的脑部疾病，医生们仍然没有完全了解。

   chī​dāi​zhèng shì yī​zhǒng fù​zá de nǎo​bù jí​bìng, yī​shēng men réng​rán méi​yǒu wán​quán liǎo​jiě.

   Dementia is a complex brain disease that doctors still do not fully understand.

   Source: CCMatrix