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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。

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Suddenly, he remembered how he had to hold two water buckets up in the air in primary school, along with the faces of the headmaster and his homeroom teacher.

NPR: Literature and Lullabies from the 'Axis of Evil'

In 2008, Reapers and Predators, the Air Force's two primary remote-controlled vehicles, will spend almost 120, 000 hours in the air on reconnaissance and intelligence missions, up from just over 80, 000 hours last year and less than 5, 000 in 2001.

FORBES: War Without Soldiers

Satellite and conventional over-the-air broadcasting will remain the primary high-def program sources until cable operators decide to carry high-def content and Hollywood delivers prerecorded HD cassettes or discs.

FORBES: Something Special in the Airwaves