If you do use coffee, just use what would be considered regular strength coffee in America, not something super concentrated like espresso.

如果你要使用咖啡，那么就直接使用美国的普通浓度的咖啡，不要使用像espresso这样的超浓度咖啡。

youdao

If you are not a coffee drinker, that's fine too: even with a 20-minute nap alone, you can feel super-fresh and productive as well.

假如你不是个爱喝咖啡的人，也没问题：就算只是打个20分钟的盹，你也会感到非常清醒，充满效率。

youdao

Right now it is a Rwandan coffee from Bukonya estate. I also use 10% of this coffee in my blend. This coffee is super sweet with a lot of coffee blossom aroma and a delightful sweet ripe frutiness.

比如我目前也用了10％的卢安达Bukonya庄园豆在我新配方中，它拥有超级的甜度表现，和大量的咖啡花香，加上令人愉悦的水果熟甜风味。

youdao