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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NASA plans to test a full-size solar sail for chemical-free propulsion and a deep space atomic clock.

此外，美国国家航空航天局（下文简称NASA）还计划测试一个完整尺寸的太阳帆，为航天器提供绿色推进能源，以及测试一个深空原子钟。

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When the last space shuttle readies for launch from the Kennedy Space Center, scheduled for July 8, NASA's giant digital countdown clock will be one of the most watched time pieces in the world.

美最后一架现役航天飞机“阿特兰蒂斯”号将于7月8日在肯尼迪宇航中心进行其最后的一次飞行 ，届时， NASA的巨大倒计时钟将成为最为世人瞩目的计时工具。

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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.

BBC: Terry's chocolate factory in York starts to be demolished