How to open a PDF file in iBooks, and not a Preview on macOS?

Can't make friends with iBooks , - download it a few .pdf files, and she opens them itself, and in the View. It is inconvenient that it is not a Dictionary, etc. In the help write not all .a pdf can be loaded into iBooks, how not to load - all can be opened via the Preview - what am I doing wrong, and teach, plz...
July 2nd 19 at 16:57
2 answers
July 2nd 19 at 16:59
In PDF some layers. It can be just a picture — the text is neither to highlight nor a dictionary to find. And maybe a layer of recognized text.
Downloaded text-only PDF, here is an example. - lue.Frami commented on July 2nd 19 at 17:02
July 2nd 19 at 17:01
managed to make friends with?
myself looking for a way

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