名词
中文翻译：快乐
同义词：
['happy', 'cheerful', 'joyful']
例句：
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1. She was so happy to see her old friends again.
她很高兴再次见到老朋友。
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2. The children were all in a joyful mood after the party.
派对结束后，孩子们都心情愉快。
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3. Joy is contagious;when one person is happy, it spreads to everyone around them.
快乐是传染性的；当一个人快乐时，它就会传染给周围的人。