The most plausible explanation is that the cluster contains a distinct ring of dark matter without any accompanying ordinary matter.

最可信的解释是星团包含一圈无任何普通物质相伴的暗物质。

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To try to find out where this ring had come from the astronomers trawled through previous literature on the cluster in question.

为了找到这圈物质的来源，科学家一头扎入以前有关这一星团的记录中。

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Nor do phones seem to ring much anywhere on the suburban Microsoft "campus, " a cluster of 35 low-rise buildings, lawns, white pines and courtyards that resemble those of a state polytechnic college.

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The topmost section features a physical volume dial that also serves as a mute switch when pushed, surrounded by a circular cluster of LEDs (for clockwise-flowing level indication) and then a secondary outer ring of capacitive buttons and LED indicators.

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