head grit

例句：

1. 1. The skull of theancient human was discovered in a cave.
   在洞穴里发现了古代人类的头骨。
2. 2. The skullis made up of several bones that arefused together.
   头骨由几块骨头融合而成。
3. 3. Skulls have beenfound in various parts of the world,dating back thousands of years.
   世界各地都发现过头骨，可以追溯到数千年前。