the original material

This process is termed "replacement" because solutions have dissolved the original material and replaced it with an equal volume of the new substance.

这个过程被称为“置换”，因为溶液溶解了原来的物质，并用等量的新物质取而代之。

We then publish both the news story and the original material in order to enable readers to analyse the story in the context of the original source material themselves.

然后我们把这些新闻故事和原材料一起公布，这样是为了我们的读者可以亲自分析这些新闻消息的内容。

In addition to the original material, each chapter includes excerpts drawn from various works, published and unpublished, by Dr. Murphy, to emphasize key points covered.

除了原始资料，每一章节还包括了从墨菲博士的各个著作中摘录的词句，其中有些出版了，有些还没有被出版过，这些词句被用来突出不是很明显的关键要点。