If you pad out a piece of writing or a speech with unnecessary words or pieces of information, you include them in it to make it longer and hide the fact that you have not got very much to say.

如果你用一些不必要的文字或信息pad out一篇文章或一篇演讲，就是说你会把它们写得更长，并掩盖你没有太多话要说的事实。

The reviewer padded out his review with a lengthy biography of the author

评论者在他的评论中添加了冗长的作者生平以拉长篇幅。