The whole country is in a state of alert.

全国正处于戒备状态。

Meanwhile Britain remains at its highest state of alert.

然而英国仍然保持最高警戒状态。

This is like a soldier in the battlefield, always the same need to maintain a high state of alert.

这就好比一个战士处于战场中，时刻需要保持高度戒备状态一样。

He said embassy staff were still in a heightened state of alert but there were no specific threats against any staff members.

他说尽管没有针对使馆人员的具体威胁，他们仍处在高度戒备状态。

Southern areas of the Netherlands are on the top state of alert after a blaze at a chemical plant near Rotterdam sent out a thick plume of smoke.

荷兰鹿特丹附近一座化工厂着火，发散出浓厚的烟雾，南部地区因此进入最高戒备状态。