资料来源 : WordNet®

topicalization
     n : (linguistics) emphasis placed on the topic or focus of a
         sentence by preposing it to the beginning of the
         sentence; placing the topic at the beginning of the
         sentence is typical for English; "`Those girls, they
         giggle when they see me' and `Cigarettes, you couldn't
         pay me to smoke them' are examples of topicalization"