They leave a blank space so that they can insert their dialogue while listening to the recording.
他们会留出空白，以便在听录音时插入谈话内容。
2
Interestingly, Schedel left two blank pages at the end for recording the rest of history.
有趣的是，舍德尔在最后留下了两页空白来记录剩下的历史。
3
These two technical terms which was used by the machine recording instrument to record binary data in many years ago, each of them are representation physical and blank.