with little warning or time for preparation
临时通知，提前很短时间通知
tours may be cancelled at short notice.
旅行可能会临时通知取消。
warn someone of something about or likely to occur, especially in a formal or threatening manner
正式警告（某人某事将会或可能发生）；正告
we're going to put foreign governments on notice that we want a change of trade policy.
我们将要警告外国政府我们要改变贸易政策。
pay no attention to someone or something
不注意
pay attention; show signs of interest
注意；有兴趣