knap

例句：

1. 1. The potatoes were knapped flat by the potato peeler.
   土豆被土豆剥皮器压扁了。
2. 2.The old book was knappedand torn in the fire.
   旧书在火中被压扁和撕破。
3. 3.The box was knapped openby a strong gust of wind.
   箱子被一阵强风压开。