这意味着数据库可能有事件时间和事件记录时间。
This means that your database might have the event time and the event recorded time.
Time——记录事件的日期和时间。
许多金融事件和其他有先后顺序的事件既需要存储日期，又需要存储每天的时间；比如记录购买完成的时间。
Many financial and other sequencing events require you to store both the date and time of day; such as recording when a purchase was completed.
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