But U. S. officials say they have seen few signs of a thaw.

但是美国官方认为，他们已经可以看到双方关系解冻的一些迹象。

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Tripoli is hit, but U. S. says it isn't trying to kill leader Gadhafi.

的黎波里遭袭击，但美国称这不是要杀死领导人卡扎菲。

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European shares also made gains in mid-day trading, but U. S. stocks were down as trading got underway.

欧洲的股市也在今天的交易中呈上涨趋势，但是美国目前的股市交易却呈下降趋势。

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But U.N.Secretary-General Ban Ki-moon said the targets are too far in the future and that more needs to be done sooner.

VOA: special.2009.07.11

Why is cancer one of the leading killers in the U. S. now but wasn't even on the charts in 1665?

为什么癌症现在是美国人的头号杀手,却甚至没有在一六六五年的名单中出现

耶鲁公开课 - 生物医学工程探索课程节选

For isothermal expansion, that means that delta u does not change, but delta q is equal to delta w?

在等温过程中，是不是内能不变，Δq等于Δw？

麻省理工公开课 - 热力学与动力学课程节选

But U.S. production is falling because of environmental restrictions on exploration and tapped-out existing gas fields.

FORBES: Brownout

But U.S. Secretary of State Hillary Clinton said Saturday the situation would not be unprecedented.

CNN: Afghan election official opposes presidential coalition

But U.S. Secretary of State Hillary Clinton insisted the sanctions will remain in place.

CNN: Talks over Iran's nuclear program resume in Moscow