Why illustrates are assential in the lay out of textbook justify in the light of its principles ?

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  • 3 weeks ago

    sorry, I can't make any sense out of this. I realize English is not your native language, perhaps you can get someone to translate for you?

    Perhaps: Why are illustrations essential in the organization of textbooks ?  The rest I can't get.

    Illustrations are not essential but increase understanding by a large factor. 

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