They have found that two oxen yoked together can actually do double the work of two oxen individually.

两只牛同负一轭，可以完成的工作是他们分别单独工作的两倍。

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But they say the work will make it possible to safely double the number of visitors permitted inside.

VOA: special.2009.06.29

As part of the new strategy, Napolitano says the United States will double the number of border security teams, and will quadruple the number of border liaison officers who work with Mexican officials.

VOA: standard.2009.03.24

Has your team been asked to take on double the work with no more resources?

FORBES: Four Rules for Leading with Purpose

Double the number of work-study jobs for college students.

WSJ: Obama State of the Union Speech Makes Populist Pitch

And in a 2010 McKinsey report, female senior executives cited the "double burden syndrome" of balancing motherhood and work as the main obstacle to women attaining more top roles in companies.

WSJ: McKinsey Tries to Recruit Mothers Who Left the Fold