欣快症

例句：

1. 1. She was overjoyed at the news of her promotion.
   她听到晋升的消息时非常开心。
2. 2. The children were all happy to spend time with their grandparents.
   孩子们都很高兴能和祖父母共度时光。
3. 3. Joy is a feeling that can bring great happiness and satisfaction to people.
   快乐是一种可以给人们带来巨大幸福和满足感的感觉。