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1·There were 15 minutes between the first air raid alert and the sounding of the all-clear signal.

从第一个空袭警报到警报解除号音其间有15分钟。《柯林斯英汉双解大词典》

2·During the air pollution red alert, the Beijing Commission of Education ordered all kindergartens, primary schools and middle schools to suspend classes.

在空气污染红色预警期间，北京市教委下令让所有幼儿园、小学和中学停课。

3·The alert level is now at a higher class than in 2002, says Air Force Brig. Gen. Jung Jae-bu, commander of the 20th Fighter Wing.

“目前的警戒水平”高于2002年，第20战斗机飞行中队指挥官，空军准将郑在卜(音)表示。

4·If pilots keep getting unnecessary alerts, they will tend to ignore them.If an alert is not issued when it should be, however, the result can be a mid-air collision.

如果它不断发出“狼来了”的警告，飞行员将会逐渐无视它的存在，反之，如果紧急关头警报没有及时发出，后果可能是撞机。

5·If an alert is not issued when it should be, however, the result can be a mid-air collision.

而如果在必要时未能发出预警，其结果就可能是空中撞机。

6·The Airparif monitoring agency said smog density was still near alert levels Monday, but rain forecast for Tuesday was expected to clear the air.

空气监测机构表示，周一雾霾浓度仍然处于警戒水平，但是预计周二的降雨能够净化空气。

7·The announcement came last night as Beijing has extended its orange alert forheavy air pollution again as smog is expected to persist until the weekend.

这个宣布来自昨晚，北京再次发布空气重污染橙色警报，预计雾霾将持续到周末。

8·Passengers traveling by air face a new security alert. Airport screeners are extra-focused on thermos-type insulated beverage containers.

乘坐飞机旅行的乘客面临新的安全警告。机场扫描仪现在更加注意热水瓶性的保温饮料罐。

9·During the recent red alert, pollution peaked at 508 on Tuesday, according to the US Embassy's air pollution monitoring service in Beijing.

据美国驻北京大使馆的空气污染监测服务中心数据显示，北京红色预警期间，污染在星期二达到峰值508微克。

10·It also initiated its first-ever air pollution red alert mechanism.

它还启动了首个空气污染红色预警机制。