He smiled as he thought about his own childhood.
Meaning: He made a facial expression that shows happiness or amusement as he used his mind to consider something about the period of a person's life between birth and adulthood that is his own.
Choice of Words: Smiled means to make a facial expression that shows happiness or amusement. Thought means to use one's mind to consider something. Childhood is the period of a person's life between birth and adulthood.
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Related Expressions