希腊和阿尔巴尼亚边界发生地震群。
An earthquake swarm occurred on the border be - tween Greece and Albania.
问：你指的是2008年二月发生在都江堰(一个离震中很近在地震中严重损毁的小镇)附近的地震群吗？
Q: You mean the earthquake swarm near Dujiangyan [a town near the epicenter badly damaged in the quake] in February 2008?
地震群是另一个控制源，因为有许多地震连续冲击数据库然后造成统计偏差，因此它们从数据库中被抽除了。
Quake swarms are another source of control, as they pepper the databases with many quakes and skew the statistics, and thus are pulled from the database.
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