原文选段:Science fiction is not so much a genre as it is a set of tools, and these tools will allow you freedoms that no other form of literature will. I once wrote a story set in the aftermath of an unimaginable cataclysm which had reversed the direction of memory, so that everyone knew everything that Original selection: Science fiction is not so much a genre as it is a set of tools, and these tools will allow you freedoms that no other form of literature will. I once wrote a story set in the aftermath of an unimaginable cataclysm which did unimaginable the direction of memory, so that everyone knew everything that