We are not only witnesses of history, but also makers of history.
我们既是历史的见证者，更是历史的塑造者。 岁月不居，时不我待。
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The Transportation Department last year estimated that requiring auto makers to achieve 31.6 mpg by 2015 would cost the industry $46.7 billion, among the most expensive rule makings in U.S. history.