Learn new languages.
Meaning: You can learn new languages spoken by characters in the world of the book, just like you do in real life. It's like saying, You can expand your vocabulary and learn new ways of communicating by reading books from different cultures.
Choice of Words: Learn is a verb that means to gain knowledge or understanding of something. New is an adjective that means not seen or experienced before. Languages is a plural noun that refers to a system of communication using sounds, words, or signs. In this context, the sentence implies that you can learn new languages spoken by characters in the world of the book.
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