birthday的意思,你们都不查查英英字典么?又不是问The day when you were born。。。
https://www.ldoceonline.com/dictionary/birthdaybirth‧day /ˈbɜːθdeɪ $ ˈbɜːr-/ ●●● S1 W3 noun [countable]
1 your birthday is a day that is an exact number of years after the day you were born
It’s my birthday on Monday.
My aunt called to wish me a happy birthday.
Anne’s birthday party
2 a day that is an exact number of years since an organization was established or an event first happened → anniversary
The City of Cleveland Orchestra is celebrating its 200th birthday.
3 → in your birthday suit