Nacks
(nack 的第三人称 -s形式) abbr. 否定应答（Negative Acknowledgement）
🗣️ 情景例句
That's all right. I hope we can help you at some other time. Good-bye.
好了，希望我们今后还能给你帮助。再见。
I bought it at half price.
我花了半价买来的。
Sure, just drop in my office some time and pick them up.
没问题，什么时候到我办公室来拿都可以。