brain可数名词吗

是不可数名词，意思是头饰，例如：

1.The hi-tech headwear uses built-in sensors to monitor brainwave activity.这个高科技智能帽内置一个传感器，能监测脑波的活动。

2.Women of the Dao tribe often wear beautiful headwear with many metal pins holding their hair.道部落的妇女往往穿着漂亮的头饰很多金属针持有他们的头发。