Nack
abbr. 否定应答（Negative Acknowledgement）
🗣️ 情景例句
We tested it last week on twelve- to fifteen-year-olds,
我们上一周曾在十二岁至十五岁的孩子中试过这项游戏，
He likes playing the violin.
他喜欢拉小提琴。
I have a letter of introduction here.
我这儿有一封介绍信。