Telescopes with small (sometimes called "fast") focal ratios do, however, produce brighter images of extended objects on film, and thus require shorter exposure times.

小(有时候称“快”)焦比的望远镜确实能够在底片上呈现出更亮的图像，因此需要的曝光时间可以更短。

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Sometimes the shorter distance is actually slower.

有时候短的距离更慢。

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Yet he sometimes feels caught between the two, as when he texts with his younger brothers, ages 12 and 19, who tend to send even shorter, faster messages.

但他有时觉无所适从，因为当他跟12岁和19岁的两个弟弟发短信时，他们发得甚至更短更快。

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However, as the last four years have shown, there are sometimes exceptions in the shorter term.

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Proponents sometimes make the challenge of producing a shorter ball seem almost trivial.

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"Clients expect yield at a shorter time frame, and sometimes double-digit returns, " said Jeffrey Tang, a director at consultants Towers Watson.

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