Meaning of nán dào:
nán dào
难道
Particle
don't tell me ...
Nǐ nándào bù zhīdào ma?
你难道不知道吗？
Don't tell me you don't know?
Adverb
could it be that...?
Nǐ nándào bù zhīdào jīntiān shì wǒ de shēngrì ma?
你难道不知道今天是我的生日吗？
Could it be that you don't know today is my birthday?
