石油价格上涨，乙醇竞争力再显（在拇指原则中，当美国石油价格达到3美元一加仑时，乙醇就有利可图，现在加州的油价刚好达到这个水平）。
As oil prices rise, ethanol starts to be competitive again (as a rule of thumb, ethanol is profitable when petrol costs $3 a gallon in America, a level it has just reached in California).
当经济仍旧紧缩时美国出现了产出和就业的背离，其中的一个解释是现在公司能够从他们的员工中榨取更多的生产力了。
One explanation for the divergence of output and employment, which started to emerge while the economy was still shrinking, is that firms are now able to wring more productivity out of their workers.
当打算利用俱乐部的影响力来筹建美国第一个收费图书馆的时候，他清楚地知道谦逊的姿态能更快地筹集到资金。
When he decided to use his Junto to launch the first subscription lending library in America, he realized that a show of humility would make it easier to raise funds.
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