periodic tectonic activity 周期性的构造活动
Online time has doubled since 2006, and social media use has moved from a periodic activity to a daily one in the same period.
自2006年以来，上网时间翻了一番，而与此同时，社交媒体的使用也已经从定期活动变成了日常活动。
To collect short-term history data, DB2 PE makes periodic snapshots of system activity at an interval you specify, the recording interval.
为了收集短期历史数据，DB2 PE 以用户指定的时间间隔（即记录时间间隔）制作系统活动的定期快照。
By recording snapshots and analyzing them on a periodic basis, you can spot both unusual activity and trends that occur.
通过定期记录快照并进行分析，可以发现发生的反常活动和趋势。
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