By looking up the elements in the rings for a given year, scientists can tell what elements were in the air that year.

通过查找某一年年轮中的元素，科学家可以知道那一年空气中的元素是什么。

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On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.

在地球上，人们认为，表明太阳黑子周期最可靠的迹象之一是树木的生长速度，就像树干横截面上可见的年轮一样。

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The poles are to remain in the rings of this ark; they are not to be removed.

这贡要常在柜的环内，不可抽出来。

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They measured the rings,or circles, inside thousands of ancient trees in more than three hundred places.

VOA: special.2010.05.25

They're going to perform underneath the Olympic rings in St. Pancras station on,

他们会在圣潘克拉斯火车站的奥运五环下面表演，

成功加入合唱团 - SpeakingMax英语口语达人

Something different takes place in each of the three rings at the same time.

VOA: special.2009.01.11

Even at this distance, they carve delicate patterns in the rings through a phenomenon called orbital resonance.

BBC: Saturn's beauty and power

It's by studying the dynamics of the icebergs in the rings that scientists hope to understand how the whole Solar System formed.

BBC: Saturn's beauty and power

"In the rings, we're learning something about our own origins, " he says.

BBC: Saturn's beauty and power