Taking the double-U type ground heat exchanger (GHE) as example, performs in-situ thermal response tests in three different seasons, and the results show that there does exist the seasonal effect.

实验结果表明，在地埋管换热器地下热响应实验中存在着季节效应。

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With the unemployment rate at 8.1% and approaching double digits, the U. S. finds its longstanding quandary over immigration growing even more difficult.

由于失业率已高达8.1%，并且还在向两位数逼近，美国发现在移民问题上长期进退两难的处境变得更加棘手。

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Even if food producers and retailers accept substantially lower profit margins in 2011, we are still guaranteed to see double-digit across the board U. S. food inflation in the first half of the year.

即使食品生产商和零售商接受在2011年大幅降低利润率，我们仍将在今年上半年看到美国食品通胀率达到两位数。

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The Obama administration has already promised to double the non-military U.S.foreign aid budget to $50 billion a year by 2012 and Clinton's speech offered no new commitments.

VOA: standard.2010.01.06

In a White House bill-signing ceremony Wednesday, the president reaffirmed a goal he set out early this year: to double exports of U.S.goods and services in the next five years.

VOA: standard.2010.08.11

Despite what he calls overblown fears of a double-dip recession, Cardillo predicts the U.S.economy will grow between two and a half to three percent for the second half of the year.

VOA: standard.2010.07.20

As the yen fell below 140 to the U.S. dollar June 8, its lowest level in seven years, economists warned of a double-U - a slow recovery suddenly cut by a new round of devaluations, say, or a meltdown in Wall Street or Russia.

CNN: FROM BAD TO WORSE

Fisher says a double-dip U.S. recession is not in the cards since it would require a global double dip, something he claims has pretty much never happened.

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Not only does it have eye candy amenities like a glass elevator and porcelain floors, but it also has a long list of green features including a solar heat pool, vent-less fireplaces fueled by bio-ethanol, and thermal glass double-glazed U.V. windows.

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