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Ron Ling just smiled, with a hint of smugness in his eyes.,Little Hao whispered, "Wouldn't it be that Little Brother intentionally hid this skill and just used it to suddenly surprise his younger sister this morning",Smiling children are smart, you know. Let children smile more, and it can also improve their intelligence. Besides, children are angels. Their laughter is the purest and easiest to trigger adults' smiles.。