World expanded beyond imagination.

Meaning: This means the book opened up a whole new world for the reader.

Choice of Words: World is the earth and all of its inhabitants and natural features. Expanded means to become larger or more extensive. Beyond means outside of or past something. Imagination is the ability to form mental images of things that are not present. So, World expanded beyond imagination means the reader's understanding of the world became larger and more extensive than they could have ever imagined.

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