Arthur C. Clarke gave us "zero-g" in his 1952 novel Islands in the Sky.

亚瑟C·克拉克在他1952年的小说《空中岛》中说道“零重力”。

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You are like the sky C always clear, always blue;

你就像天空，永远晴朗、永远蔚蓝；

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The stability and space correlation about the sky-wave propagation time-delay in Loran-C system are studied.

研究了罗兰-C天波传播时延的稳定性与空间相关性。

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C-notes falling from the sky making a beeline direct for their bank account?

FORBES: Why "No" is the Most Powerful Word You Can Use in 2013

Samuel Colman's watercolor "Wharf at Yonkers" (c.1869-70) takes a slightly different tack, his low viewpoint emphasizing the open sky and the broad stretch of Hudson waterway framed by the Palisades and the North Yonkers hills.

WSJ: River Romantics | The Panoramic River | Hudson River Museum | By Barrymore Laurence Scherer