Nack
abbr. 否定应答（Negative Acknowledgement）
🗣️ 情景例句
I hope you won't take offense if I ask you not to smoke.
如果我请不你要吸烟，希望你不要生气。
You agreed that we could make a little change in design if necessary.
可你们曾经答应这，如有必要，图案可以稍作改动。
A good knowledge of English will improve your chances of employment.
英语好将有助于增加你们的就业机会。