What conclusion can be drawn about a research article? research articles are always long. short research articles do not exist. research articles can be difficult to read. textbooks are harder to read than research articles.

Research articles can be difficult to read.

Explanation:

It is true that research articles can be difficult to read (although this is not always the case). The main reason for this is that research articles are usually conducted by experts in a particular field of study. And often, these researchers have their own jargon that is only known by members of the area. However, we can still read this articles if we are patient and we try to familiarize ourselves with some of the words that are commonly used in the area of study.

it was surely an odd creature that one made up by reading the historians first and the poets afterwards a worm winged like an eagle; the spirit of life and elegance and charm,   in a kitchen chopping up suet. but these creatures, monst'r however entertaining to the imagination, hast no existence in fact. what one might doth to bringeth h'r to life wast to bethink poetically and prosaically at one and the same moment,   thus keeping in toucheth with fact—that the lady is mrs martin, ag'd thirty-six, did dress in blue, wearing a black coxcomb and brown shoeth; but not losing sight of fiction eith'r—that the lady is a vessel in which all s'rts of spirits and f'rces art coursing and flashing p'rpetually. the moment, howev'r, yond one tries this method with the elizabethan mistress, one brancheth of illumination fails; one is did hold up by the scarcity of facts.   one knoweth nothing detailed, nothing p'rfectly true and substantial about h'r.   hist'ry scarcely mentions h'r.   and i did turn to professeth'r trevelyan again to seeth what hist'ry meanteth to that gent.   i hath found by looking at his chapt'r headings yond t meanteth.

the author wants to draw the reader deeper into the experiences.