Singularity is almost invariably a clue. The more featureless and commonplace a crime is, the more difficult is it to bring it home. (Sir Arthur Conan Doyle, British writer)

奇特几乎总能提供一种线索。一种犯罪越是普通，越是不具特点，就越难以查明。(英国作家柯南·道尔爵士 A)