但是，如果来自美国尤其是欧洲的消息老是周而复始地让投资者惊魂的话，它们就很难取得长久的进展。

But that they'll find it hard to make lasting progress if news from the United States and especially Europe keeps periodically scaring the devil out of investors.

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希腊人仅把它们认作众星球是在它们固定的轨道做着优雅的周而复始的旋转，却不认为天体穿梭于星空有变化的运动着。

Instead of having to think about heavenly bodies moving through space, or changing their places, the Greeks could simply think in terms of fixed spheres rotating gracefully on their axes.

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