An even larger region is under orange alert for smog, after red alerts late last month forced traffic off the roads and closed some schools.

启动霾橙色预警的地区范围更大。上月底发布的红色预警曾导致车辆限行和学校关闭。

Fig5 Keep red alerts on those cards without extension number , handed out with a smiley explanation "we're justshavingssome new ones printed".

图五：如果递上的名片没有分机，那家伙还一脸笑意地解释“马上我们就要印新的了”，保持高度警惕了。

Red is used to highlight those alerts that have gone beyond warnings to actual problems, as shown in Figure 2.

使用红色高亮显示严重级别高于警告，已成为实际问题的提醒，如图2所示。

Skin appears red, it should be said that skin color is the most common alerts.

肌肤出现红色，应该说是肌肤颜色警报中最普遍的。

Four-tier alerts - blue, yellow, orange and red - will be issued on "heavy pollution" days.

在空气重污染情况下将会发出预警，霾的预警级别由低到高分别为蓝色、黄色、橙色和红色四个等级。