electric rock drill bit

例句：

1. 1.The electric rock drill bit is very effective for drilling through hard rock.
   电动岩石钻头在钻穿硬岩方面非常有效。
2. 2.This electric rock drill bit is designed to be lightweight and easy to use.
   这种电动岩石钻头设计轻便且易于使用。
3. 3.The electric rock drill bit is a popular choice for those who need to work in remote areas.
   电动岩石钻头是那些需要在偏远地区工作的人的首选。