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These periods became known as temporal hours, because their duration varied according to the changing length of days and nights with the passing of the seasons.

这些时段被称为“日光时”，因为它们的持续时间随着不同季节而带来的昼夜长短的变化而改变。

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And changing that is one of the company's biggest business challenges these days.

而改变这一点则是该公司这些日子以来最大的商业挑战之一。

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Later,a stagecoach could make the trip in thirteen to fourteen days by moving day and night and changing animals often.

VOA: special.2009.03.30

I heard that Brooklyn is changing these days. Can you tell us about the changes?

我听说现在布鲁克林正在改变。你能跟我讲讲那些变化吗？

布鲁克林的变化 - SpeakingMax英语口语达人

Just like metro papers, many small town newspapers are feeling the pinch of the changing industry these days.

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For example, for Oregon in 1996 the first three numbers cycled from 540 to 544, changing every 60 days or so.

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Many mall trusts are changing hands these days at significant discounts to their net asset values, or NAVs, says Green Street Advisors, an independent research firm specializing in REITs.

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