sternum chisel

例句：

1. 1. He used a sternum chisel to remove the bone from his chest.
   他用一个胸骨凿子从他的胸部取出了骨头。
2. 2.The chisel was sharp enough to carve wood with ease.
   这个凿子足够锋利，可以轻松地雕刻木头。
3. 3. The chisel was used to shape the metal into the desired form.
   这个凿子被用来将金属塑造成所需的形状。