The National Meteorological Center issued an orange alert, saying snow and sleet will sweep across central, eastern and southern regions from Friday night through Saturday.

中央气象台发布暴雪橙色预警，预计周五晚到周六我国中部、东部、南部地区将有新一轮强降雪。

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Beijing has issued and extended an orange alert for heavy air pollution as persistent smog continues to shroud the Chinese capital.

近期雾霾持续笼罩首都北京，北京市发布并延长了空气重污染橙色预警。

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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。

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because all we konw now it's orange alert, the alert level has gone up or gone down We don't really know what it goes on behind the scene.

我们都知道现在是橙色警报，警戒线时高时低,我们真的不知道,事情背后是如何处理的。

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They said an orange alert was in effect for trains, buses and the airports.

NPR: New York, Los Angeles Step Up Security

New York City is to remain on Orange alert, and airspace restrictions for Washington and New York introduced during the war against Iraq will remain in place but under review.

CNN: Terror threat lowered to Yellow

New York has been on "orange" alert, or the second-highest level -- indicating a high risk of terror attack -- since the color-coded warning system was established after the September 11, 2001 attacks.

CNN: New York subway system on alert