加强的警戒状态

提高警惕（heightened是heighten的过去式）

heightened risk───高风险

frightened away───吓跑；吓走

heightened───v.提高，升高（heighten的过去分词）

heightener───加高器

brightening agent───增白剂；增亮剂

airborne alert───空中待战，空中警戒

frightened into───恐吓做（某事）

Germany was already on heightened alert.───德国已经加强了安全戒备。

A heightened alert of some sort?───是否会导致警戒级别的提高?

Security forces in India's biggest cities were put on heightened alert.───在印度各大城市，安全部队提高了警戒级别。

Troops were on heightened alert for any reaction to the news.───部队高度戒备的任何消息的反应。