演讲者用一个有趣的故事作为开场白来吸引听众的注意力。

The speaker used an interesting story as a ___lead-in to grab the audience's attention.

请检查电视的电源线是否插好了。

Please check if the ___lead-in for the TV is properly plugged in.

新闻播报前通常会有一段简短的导语介绍主要内容。

There's usually a short ___lead-in summarizing the main points before the news broadcast.