Let me break it down. The first sentence is: "Composite materials have become an integral part of modern engineering, offering a unique combination of properties that make them ideal for a wide range of applications." So, the words like "Composite materials" are part of the title and should stay. The rest, like "have", "become", "integral", etc., each need three synonyms. Similarly for the other sentences.
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After breaking down each word in the sentence, replacing non-proper nouns with three alternatives. For example: Let me break it down