You know, if a story needs to be explained, then there's something missing in it. Stories should be complete in themselves, or provide enough context for the reader to go away and look it up. Otherwise, you're actually using up more words than the form allows.
That's why Hemingway's classic story is a story - "Baby shoes for sale. Never worn." - it provides an entire implied backstory that a reader can pick up through intuition, as well as subtext in what is essentially the conclusion.