因为它的第一个音节是开音节。

/ˈleɪdi/

n. 女士，夫人小姐妻子Her mother was a titled lady.

她母亲曾是个有爵位的贵夫人。

I was humped like an old lady.

我像个老妇人似的驼着背。

She's a very sweet old lady.

她是一位非常亲切的老太太。

What seems to be the trouble， lady?

有什么麻烦吗，女士

She's a lady of mystery.

她是一个神秘的女人。