Meaning of duì le:
duì le
对了
Interjection
Correct!; Oh, that's right, ... (when one suddenly remembers sth one wanted to mention)
Duì le, wǒ wàngjì dài yàoshi le.
对了，我忘记带钥匙了。
Oh, correct! I forgot to bring the keys.
Duì le, wǒ wàngjì gàosù nǐ, wǒmen míngtiān yào kāihuì.
对了，我忘记告诉你，我们明天要开会。
Oh, that's right, I forgot to tell you, we have a meeting tomorrow.
Particle
Oh, by the way, ...
Duì le, nǐ míngtiān yǒu kòng ma?
对了，你明天有空吗？
Oh, by the way, are you free tomorrow?
