名詞 lead-in:

1. the introductory section of a story
   同義詞：lead, lede
2. wire connecting an antenna to a receiver or a transmitter to a transmission line

1. He told an amusing story as a lead-in to the serious part of his speech.
   他講了一個有趣的故事作他演說中重要內容的引子。

lead-in

n.（名詞）
Opening or introductory matter:
引子：開場白或介紹性的事務：
例句：
The joke served as a lead-in to a discussion of more serious matters.
這個笑話是為了引入討論更嚴肅的問題

A program, as on television, scheduled to precede another.
導入部分：被優(yōu)先安排在另一節(jié)目之前的節(jié)目，如電視上
The wire that connects an outdoor antenna to an electronic transmitter or receiver.
引入線：將室外天線與電子發(fā)射機或接收器連接起來的電線