birthday

Happy birthday!
意：祝你生日快乐!
例.Happy birthday? Jane, this is my present--guess what it is.
简，生日快乐!这是我的礼物，猜猜是什么。
Lxt me be the first to wish you a happy birthday!
让我第一个来祝你生日快乐吧!

in birthday suit

意：没穿衣服;光屁股;裸体
例 .Here's a picture of me in my birthday suit, aged three
这是我三岁时光着屁股照的相片。
Please wait in the sitting room. I've just been having a bath and, and I'm...still in my birthday suit!
请在客厅等一下:我刚洗完澡，还一还光着身子呢!