Unlike atom-thick slices, where the electrons travel around the edge, in this case layers of electrons should circle a non-conducting interior like a ribbon encircling a birthday present.

与电子只在边缘移动的一个原子厚度的薄片不同，上诉情况下一层层的电子绕着不导电的内部区域流动，就像缎带绕着生日礼物一般。

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The U.S. Departments of Commerce and Interior are implementing the National Travel and Tourism Strategy, which they presented to the President in May.

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Since the President issued an Executive Order in January and the National Travel and Tourism Strategy was subsequently released by this Administration in May, the Departments of Commerce, Homeland Security, Interior, and State have put a priority on expanding travel to and within the U.S., while remaining vigilant in protecting our national security.

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