Before National Day, people are busy with washing national flags.

国庆节前，人们忙着清洗国旗。

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Is it necessary to complete the design before National Day?

国庆节前完成这个设计有必要么？

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We have determined to get the work done before National Day.

我们已决定国庆节前完成这项工作。

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Even if the plan to electrify the U.S. auto fleet is achieved, it will be many years before our national use of 20 million barrels a day is meaningfully reduced.

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"The spill likely occurred sometime the day before Enbridge reported it to the National Response Center, " said Rep. Jim Oberstar, D-Minnesota, chair of the committee.

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Los Angeles, California (CNN) -- There were several speeches at the first Earth Day -- back in 1970, before the disco era -- on the National Mall.

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