brain

大脑是一个复杂的器官。

The ___brain is a complex organ.

锻炼对大脑有好处。

Exercise is good for your ___brain.

我们需要保护我们的大脑。

We need to protect our ___brains.

医生用扫描仪检查了他的大脑。

The doctor used a scanner to check his ___brain.