学生们在班级进行了一次劳动竞赛活动。

Students held a labour competition in the class.

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并且，我们人们是否参与到了一次代价昂贵的“军备竞赛”中，一次被迫付出巨大到足以再一次摧毁我们国家经济的代价来进行防卫的竞赛？

And, are we engaged in a costly "arms race," one that imposes enormous costs for defense, costs that might end up bankrupting (yet again) our economy?

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百事可乐将从1月13日起展开竞赛，每月进行一次，为期十个月。

Pepsiwill have contests every month for 10 months beginning Jan. 13.

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