Until now, many sellers that have a physical presence in only a single state or a few states have been able to avoid charging sales taxes when they ship to addresses outside those states.

到目前为止，许多只在一个州或几个州有实体店的卖家，在往这些州以外的地方运送货物时，都能够避免征收营业税。

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He reasoned that some single-celled creatures are known to enter a hibernation-like state and survive for years with no air or food.

他推断，已知的一些单细胞生物进入类似冬眠的状态，在没有空气和食物的情况下存活数年。

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Schmidt of Michigan State University, who led the new analysis, said, "no single intellectually coherent vision dominates U.S. educational practice in math or science."

领导这项新调查的来自密歇根州立大学的施密特说：“在美国的数学和科学教育实践中，没有一种理智而统一的观念。”

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So can this single-state franchise go national?

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The value of euro banknotes in circulation and the market for euro-denominated securities already rival the dollar, a long-established currency backed by a single nation-state.

ECONOMIST: The gains outweigh the losses

On Wednesday, the Work and Pensions Committee (at 9.30am) has its first evidence session on the draft to create a single-tier state pension.

BBC: Week ahead in committees