translation.en: If he turns to a particular page, he finds an annotation by maybe an expert or a friend of ours that gives him a little bit of additional information about whatever is on that particular page.
translation.zh: 如果他翻到特定的某页， 他会看到我们的朋友中的某个专家 所作的一个注脚，给他提供一些 关于这一页的附加信息。