a chunk of rock的用法和样例：
- Karen whirled around, hoping to catch Kami in the act, but he was way off to her left inspecting a chunk of rock near the cave wall.
- A chunk of the cliff had cracked off in a storm.
- I won quite a chunk of money in the lottery.
- Two polar bears are seen on a chunk of ice in the arctic.
- A chunk of its purple crystal section cracked into pieces.