什么是快乐 英语怎么说

快乐是一种幸福的感觉，它来源于人的内心。英文中可以用 happiness 来表示快乐。
例句：
She was filled with happiness when she heard the good news. (当她听到好消息时，她充满了快乐。)
The children were playing happily in the park. (孩子们在公园里快乐地玩耍。)
He felt a sense of happiness when he held his newborn baby in his arms. (当他抱着新生儿时，他感到快乐。)
另外，快乐也可以用其他词来表示，如 joy, delight, pleasure 等。例如：
She was filled with joy when she saw her old friend. (当她看到她的老朋友时，她充满了欢乐。)
He took great delight in spending time with his grandchildren. (他很高兴能和孙子们在一起。)
She experienced a great deal of pleasure from listening to music. (她从听音乐中获得了巨大的快乐。)