a can of shoe polish的用法和样例：
- But what could I do about it? Hit him with a can of shoe polish? A man his size could grind me into the floor. If only someone would come in!
- Please give me a can of "Edgeworth".
- He opened a can of beer and drank it.
- To open, pull tab, eg on a can of beer.
- While fishing, he usually opens a can of worms.