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"欢快的" 的英语是 "happy" 或者 "cheerful". 这个词源自古英语 "hap" 或 "hepp"，意思是 "幸运、成功或偶然的好事"。例句：
She has a happy disposition and always greets me with a cheerful smile.
The party was full of happy people enjoying the music and each other's company.
I love spending time with my dog because he always makes me feel happy and relaxed.
来源：作文地带整理
