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.
  到了某個時刻，此區域的密度比周遭高太多，導致相吸的重力壓倒宇宙膨脹，區域就開始塌縮。
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