A look of delight appeared on her face; she was clearly very happy.
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悦 is the classical Chinese character for 'pleased / joyful.' It appears in the opening lines of the Confucian Analects (论语): 学而时习之，不亦说乎 — where 说 is an archaic variant of 悦. In modern Chinese 高兴 or 快乐 are far more common for everyday happiness.
