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Chinese (Traditional) translation of “birthday”

birthday

noun [C]     /ˈbɜːθ.deɪ/ US  /ˈbɝːθ-/
the day that is exactly a year or number of years after a person was born
生日
Happy birthday!
生日快樂!
Are you going to Ellen's birthday party next week?
下周你會參加愛倫的生日派對嗎?
It's her 21st birthday.
這是她21歲的生日。
Describing age and birthdaysBirthdays and anniversaries
(Definition of birthday noun from the Cambridge English-Chinese (Traditional) Dictionary © Cambridge University Press)

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