Mr Summers has previously remarked on the tension between superpower status and net foreign indebtedness.

萨默斯此前已评述过美国的超级大国地位与净债务(外债)国身份之间的矛盾。

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But after two hours and 41 minutes, Federer finally brought the tension to an end and wrapped up a deserved victory when Murray put a backhand into the net.

但在打了2个小时41分钟之后，费德勒将比赛带向尾声，在穆雷反拍击球下网之后，他取得一场当之无愧的胜利。

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The results show that back and front tension net only possesses the function of controlling sheet shape but also can adjust sheet thickness in the process.

模拟结果表明，前后张力不仅具有矫正板形功能，还具有微调板厚作用。

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The net migration target has caused some tension within the coalition, with Lib Dems and some Tories - including Mayor of London Boris Johnson - believing it risks send the wrong signals to foreign students and hampering the economic recovery.

BBC: Annual net migration to UK falls below 200,000

In a 2010 post he writes about the tension between immigration and the social safety net, but again this does not apply to high skilled immigrants who make a stronger social safety net more affordable.

FORBES: A Question for Paul Krugman