A sentence that teaches a new vocabulary word should always be pellucid, that is, its style and meaning should be easily understandable so that you can derive the definition from the sentence.
You may have heard the word lucid, which means clear. Both lucid and pellucid derive from a Latin word that means "to shine through." Pellucid water is clear, a pellucid sky is a particularly intense shade of blue, pellucid prose is writing that's easy to understand, and pellucid singing is clear and light in tone.
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