The next major step in the transformation of roasted beans into a cup of espresso is the extraction of the active components in the roasted and ground coffee by heated water.

• 要将烘焙好的咖啡豆转变成一杯浓缩咖啡，下一步，就是把烘好的咖啡豆磨碎，用热水将里头的活性物质给萃取出来。