Based on the number of such bodies in the area surveyed, the astronomers then extrapolated that such objects could be extremely common.
基于在此区域内研究发现的星体数量，天文学家推断这种星体可能是很普遍的。
It was less common to be extremely overweight, but these patients had even further problems.
极端的超重也是比较少见的，但是这类病人却有着更多的问题。
Allergy to cats is extremely common, and can be a major problem even for people who don't own cats.
对猫过敏是非常普遍的，即使这对那些不养猫的人来说也是个大问题。
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