overdensity

常见例句

• At a certain point, the overdensity of the region compared with its surroundings becomes so pronounced that its gravitational attraction overcomes the cosmic expansion.The region starts to collapse.
  到了某个时刻，此区域的密度比周遭高太多，导致相吸的重力压倒宇宙膨胀，区域就开始塌缩。
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