Definition
A phrase used to convey birthday wishes, synonymous with "Happy birthday."
生日快乐
"Many happy returns of the day! Wishing you joy today and every day to come."
「祝你生日快乐！愿你今天和未来的每一天都充满欢乐。」
As she unwrapped her gifts, we all said to her, "Many happy returns of the day!"
当她拆开礼物时，我们都对她说：「祝你生日快乐！」
"I heard it's your birthday today, many happy returns of the day!"
「我听说今天是你的生日，祝你生日快乐！」