罗斯丁说，“由于我们没有完全理解弦理论，因此不能排除基于弦的各种可能模式。”

Since we don t have a complete understanding of string theory, it s impossible to rule out all possible models that are based on strings, said Rothstein.

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最早的联邦鸭票是由J.N.“丁”·达林设计的，他是爱荷华州得梅因市的一位政治漫画家，当时被富兰克林·罗斯福总统任命为生物调查局局长。

The very first Federal Duck Stamp was designed by J.N. "Ding" Darling, a political cartoonist from Des Moines, Iowa, who at that time was appointed by President Franklin Roosevelt as Director of the Bureau of Biological Survey.

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他补充说，对普京的政策感到很满意，认为这些政策是有序的。 包罗丁说，大部分俄罗斯公民都有共同的感受。

Borodin says most Russian citizens feel the same.

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