Even though they occur randomly in time, earthquake of similar sizes (eg, approximately the same magnitudes) are expected to follow a trend in time and happen at relatively the same time intervals.

即使他们在时间、地震过程中随机发生的相似尺寸(如，大约相同的大小)将去跟随潮流在时间和发生在相对同样的时间间隔。

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JetBlue sends an average of 23 surveys out randomly per flight, though the airline makes sure that no one gets more than one survey within 90 days, and gets back a total of 1 million a year.

WSJ: What United, American, Delta, Southwest, JetBlue, Alaska, Virgin America Airlines Learn From Customer Surveys

Mostly, though, I just let my local pictures directory randomly throw a slide show up on my idle computer screen, surprising myself with digital snaps, downloaded art, and carefully scanned prints from yesteryore (memories nearly lost).

FORBES: As The Value Of Content Declines, The Need To Analyze It Increases