Even if U.S.economic output expands in 2010 and more Americans head back to work, both critics and supporters of the president say the nation faces a more serious challenge to future economic viability: a rapidly growing deficit and a national debt estimated at more than $12 trillion.

VOA: standard.2010.01.15

After all, we're taking the output work that we get from the right, and using it all to drive the left.

毕竟，我们利用,右边产生的功，来驱动左边的热机。

麻省理工公开课 - 热力学与动力学课程节选