Olive oil has been a main food in the Mediterranean（地中海的）countries for thousands of years, and some olive trees that are hundreds of years old still produce fruit.
Almost everyone knows that olive oil is good for our health. But what most people may not realize is that olive oil is used for a lot more than just food. People make soap out of it, polish diamonds（钻石）with it, and burn it for light. In ancient times, olive oil was even used as weapon（武器）.
These days, more and more people all over the world are discovering that olive oil may be the best oil for cooking. In the United States, people use five times（倍）more olive oil today than they did 20 years ago.
Nowadays, most of the world's olive oil is still produced in the Mediterranean countries such as America and Australia also produce it. Spain produces the most olive oil in the world, followed by Italy and Greece.
