There are three basic grades of edible olive oil, and several types within each grade. Extra virgin includes "premium extra virgin" and "extra virgin"; virgin comprises "fine virgin," "virgin," and "semifine virgin"; and olive oil includes what used to be called "pure olive oil" and "refined oil."
有点类似土鸡蛋,分“真土鸡蛋”,“正宗土鸡蛋”,“真正土鸡蛋” 和“真正正宗土鸡蛋”。