At present the world most coffee beans mainly come from three original varieties, they are Arabica beans, Robusta beans and Liberian beans.

目前全世界最重要的咖啡豆主要来自阿拉比卡，罗伯·斯塔及利比里亚这三个原品种。

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As we mentioned earlier, in Italy, some robusta beans will often times be added for the additional crema, caffeine, and complexity they contribute to the blend.

在文章前面提到过，在意大利，一些罗伯斯特咖啡豆被添加到混合咖啡中，以增加其油脂、咖啡因以及咖啡风味的复杂性。

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Death Wish Coffee is made from Robusta beans which contain 'nearly double the amount of caffeine' than the Arabica beans used by high-end roasters, according to experts.

据专家说，“死亡之愿”咖啡是由罗布·斯塔咖啡豆制成的。同使用高端烘焙器处理的阿拉比卡咖啡豆相比，这种咖啡豆的咖啡因含量还要多两倍。

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By contrast, steeped or percolated coffee made with robusta beans is very strong in caffeine.

ECONOMIST: Espresso coffee

Around 70% of production is the robusta type of beans, the more bitter and cheaper variety than arabica.

WSJ: India's Taste for Coffee to Affect Bean Prices

There is also a fantastic resource on the different types of beans available and how they are processed - discussing the difference between Arabica and Robusta coffees and a very interesting explanation of how monsooned beans are made.

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