Nack
abbr. 否定应答（Negative Acknowledgement）
🗣️ 情景例句
By the way,
顺便问一声，
All is not gain that is put in the purse.
放入钱包的钱财，并非都是应得的。
That's right! A friend gave me a photo. I wanted to show it to you.
对！一位朋友给了我一张照片。我要拿给你看看。