Nack
abbr. 否定應答（Negative Acknowledgement）
??? 情景例句
at all the great places in the city.
去城市所有的好地方看看。
Before gold,even kings take off their hats.
在黃金面前，國王也要脫帽。
Our product is lower priced than the competition.
我們產品價格低廉，具有競爭力。