A child's smile is always so pure.
Meaning: This means that a child's smile is natural and genuine, without any pretense or artificiality.
Choice of Words: Smile is a noun that refers to the facial expression that shows happiness or amusement. Pure means free from anything that makes something dirty or bad. Putting them together, "A child's smile is always so pure" highlights the innocence and genuineness of a child's happiness.
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