The compressed grounds adhere to one another thanks to a thin coating of oil, which is as viscous as honey.The oil binds the particles together into a condensed maze of minuscule air passages.

• 由于咖啡颗粒外围有一层黏如蜂蜜的油脂，使得压紧的咖啡粉会彼此黏附，形成许多细小且空气通道密集的迷宫。