Understanding the distance, or the queries' output behavior, is crucial in determining the most effective option for the individual query.

对距离的理解，或者说对查询的输出行为的理解，对于为不同查询选择最有效的选项是至关重要的。

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BodyMedia CEO Christine Robins says the company has the world's largest living database of energy output, activity and behavior change.

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The economic burden of the tax system, which measures the lost economic output from a tax system that penalizes productive behavior.

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"It's always a disappointment when someone's personal behavior doesn't line up with their artistic output or your enjoyment of their art, " Levy said.

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