The following sentence is from **[100 Greatest Science Discoveries of All Time](http://www.dadazi.net/new/diff/100science/book08/scbk08-03.html)** by Kendall Haven: 

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> Small dishes of deadly staphylococci, streptococci, and pneumococci bacteria were lined and labeled across the one lab bench that stretched the length of Fleming's lab.
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I can understand either "one lab bench" or "the lab bench". How should I understand "the one lab bench"? Why can the words "the" and "one" be put together?