Nacks
(nack 的第三人称 -s形式) abbr. 否定应答（Negative Acknowledgement）
🗣️ 情景例句
Mr. Lu, everything is OK. Your booking is from today through Wendnsday. Single room.
陆先生，没问题的。您从今天订到星期三，单人房。
Many a slip (many things fall) between the cup and the lip.
酒杯来到嘴唇边，得饮与否未可知；物未到手前，未能算己有；凡事难以十拿九稳。
Carbonated drinks are acidic, and slightly safer.
碳酸饮料是酸性的，就更安全一些。