With wide broadcasting of vampire themed films and TV series, vampire has regained vitality. The source of vampire can b......

The origin of Utopia can be traced back to ancient Greek wisdom： Plato first proposed his ideally equal realm in The Repu......

【Abstract】English advertisement which can be traced back to the medieval times has played a very important role in hum......

1 Introduction The science of sound in ducts can be traced back to the time when the sound wave equation was first deriv......