cluster ⪢⪢
http://qindex.info/i.php?x=22872
 cluster ⪢⪢
http://qindex.info/i.php?x=22873
○○○ pneumonia ⪢⪢
In December 2019, there was a cluster of pneumonia cases in China. Investigations found that it was caused by a previously unknown virus, now named the 2019 Novel Coronavirus.
http://qindex.info/i.php?x=7218
 structure of the universe
-- cluster, glob
http://qindex.info/i.php?x=4026
 Beehive Cluster
http://qindex.info/i.php?x=14983
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