lead-in
/ˈliːdˈɪn/noun
1
- an introduction or preamble which allows one to move smoothly on to the next part of something引入, 导入; 序文：
as modifier the lead-in note.引言, 导言。
2
- a wire leading in from outside, especially from an aerial to a receiver or transmitter引线, 进线, （天线）输入端。