I had to find a way to grind the corn into flour, but the rocks on the island were not hard enough.
我必须想办法把玉米磨成面粉，但岛上的岩石不够坚硬。
2
Use a coffee grinder to grind the sheets into a powder.
利用咖啡研磨机把一大片磨碎成粉末。
3
If Spain falls into crisis, the entire credit system in Europe could grind to a halt and that would send tremors throughout the world's financial system.