But because they tend to live in clusters, they can be the source of outbreaks.
然而，因为他们大多为群居生活，这可能使得他们成为疾病爆发的源头。
The efficient machines can be arranged in clusters, and they can function in extreme weather.
高效率的机器可以成群安放，在极端天气下也能生效。
You can see stars in clusters in the night sky.
你可以看到夜空中的星群。
You can see stars in clusters in the night sky.
你可以看到夜空中的星群。
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