break off corn cobs

例句：

1. 1.The car broke off a piece of the road as it hit a pothole.
   汽车在碰到一个坑时，从路面上切下了一块。
2. 2. She broke off her engagement to marry someone else.
   她与另一个人解除了婚约。
3. 3.The tree broke off in two pieces when the storm passed.
   暴风雨过后，这棵树分成了两半。