a puddle of rainwater的用法和样例：
- Look, her matches are falling in a puddle of water!
- His chair sat in a puddle of books and magazines.
- A puddle of water or a patch of mud may make them break a leg or sprain a knee.
- I was afraid his whole plump body would melt into sweat, the way wax candles melt down to a puddle of oil.