看到烟后，我就设法发出警报。
据卫报了解，这种安保力量的戏剧性增长是在一项长期情报源发出警告后实行的，在过去，这一情报源已证实了它的可靠性。
The Guardian understands the dramatic increase in security was carried out on the basis of an alert that came from a long-term intelligence source who has proved reliable in the past.
最近的研究表明，这种鸟类的雄鸟在捕食者发出警告声音后，发起行动以引起获取雌鸟的关注。
It turns out that males get the attention of potential mates by making their move after a predator announces its presence.
应用推荐