We discuss the feasibility of realizing a cold atom space clock with counter-propagating cold atoms in microgravity.

在本文中我们讨论了在空间微重力环境下利用对射冷原子团实现空间冷原子钟的可能性。

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Back on Earth, space scientists and engineers worked around the clock to design and test new ideas to help the astronauts survive.

VOA: special.2009.07.22

In fact, the device is so simple to use that the manual devotes more space to the clock functions than the camcorder ones.

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They're also cleaning the Mets' clock in newspaper column space, which was rarely the case a generation ago.

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The Grade II listed Time Office, which incorporates an Art Deco clock tower, has already been converted into office space.

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